Birds, Volunteers and Visitors

It's not too late to sign up for the Holiday Birding Tour!

IT’S NOT TOO LATE TO SPEND YOUR HOLIDAYS IN THE RAINFOREST!

DECEMBER 17-22

Space is still available on our Holiday Birding Trip, so join us for spectacular birding through the tropical forests of the Osa Peninsula! This five-day trip includes extensive birding, forest hikes, and nightly talks and excursions with our staff of biologists and conservation professionals.  The trip culminates in the National Audubon Society’s Christmas Bird Count—where you, along with thousands of other citizen scientists throughout the Americas, can participate in the longest running wildlife census to assess the health of bird populations.

The Osa Peninsula is the wildest, yet most under-birded, corner of the country.  It is home to over 460 species of birds, including the healthiest population of Scarlet Macaws in Central America, Red-capped Manakins, Yellow-billed and Turquoise Contingas, and even the Harpy Eagle.  Osa Conservation’s birding trips are led by resident ornithologist, Karen Leavelle, as well as trained naturalist guides who are intimately familiar with the bird species and tropical ecosystems of the Osa.

Your participation in the Holiday Birding Tour directly supports OC’s avian conservation and education programs. We invite you to be part of our mission to conserve the Peninsula’s globally significant biodiversity and we hope to see you on one of these fantastic trips!

For more information on our Holiday Birding Tour, or to see a trip itinerary, please visit our website at www.osaconservation.org/ConservationTrips.html. For trip registration or questions please contact Emily Angell at emilyangell@osaconservation.org or Karen Leavelle at karenleavelle@osaconservation.org.

Birds

Featured Bird: White-crested Coquette

Male White-crested Coquette

Of all the hummingbird species, the coquette males that are most highly adorned with ornate feathers that are there to likely help in territorial defense and enhance species recognition.  The White-crested Coquette (Lophornis adorabilis) is the only coquette found here on the Osa Peninsula and is regionally endemic to south western Costa Rica and Western Panama.

The male of this species, which is also sometimes called Adorable Coquette, is known for its white crest and long green cheek tufts and may be arguably one of the most sought after birds to see when one visits this region.  They wander through forests high in the canopy and low along forest edges feeding on the nectar of flowering Inga, Vochysia, Stachytarpheta and Lonchocarpus plants and will also take small spiders and insects.  They hover with their tales cocked upward while feeding.

Male White-crested Coquette showing cheek tufts.

While courting a female the male will make short arcs side to side not much more than about a foot in either direction in front of the female.  He uses his colorful good looks to defend his flowers within his territory and the female takes on all nest duties with no help from the male.  The small lichen covered nest holding two minute white eggs is placed on the fork of a branch along the forest edge or a clearing and is not very well concealed.

They are said to be found from 300 meters up to 1220 meters but we have seen them here at the Piro Research Center which is near sea level as well as up along the Greg Gund Conservation Center’s northern border at Cerro Osa which sits at about 300 meters all within the last month.  At the moment they are engaged in reproductive behavior which takes place during the rainy season from December to February with courtship seen as early as October.   The male will lose his ornate regalia when the breeding season is over.

Birds

Birds and Rain

Gray-headed Tanager at Playa Piro

So how do birds survive in a tropical rainforest when it rains a lot?  Let me be clearer; when it rains nearly every day for 2 weeks straight?  The rainy season here in Costa Rica lasts from May to November increasing in the amount of rainfall as the season progresses.  October and November are notorious for being the wettest months of the year.

Well, the pattern seems to be holding up this year as expected.  Over the last few weeks the rain has let up very little and as it went on and on, I started to wonder; how do birds keep themselves fed with so much rain, and intense rain at that?  Obviously when there are gaps in the rain the birds can take advantage to hunt or search for fruit, but when it rains hard for hours or days at a time the opportunity to feed becomes limited, fat reserves would likely decrease and stress levels increase.

When birds are faced with seasonal rains many of them will migrate downhill where, as it turns out, there is less rain.  It rains quite a bit more at higher elevations than it does at lower elevations and we have seen that pattern play out right here between the Piro Research Center located just above sea level, and the Greg Gund Conservation Center at Cerro Osa which sits at about 250 meters.  The difference in elevation wouldn’t seem that dramatic, however in the month of October alone Piro received 74.9 cm (29.5 inches) of rain while Cerro Osa received 145 cm (57 inches).  That is nearly double and impressive considering that Cerro Osa is only a mere 2 km uphill from Piro.

Seasonal migrational movements are common in tropical bird species which roam the forest in search of food resources during the non-breeding season while temporary migrational movements may also be just as common place for those birds escaping inclement weather here in the tropical rainforest.  Food resources are not generally more abundant at lower elevations but the feeding opportunities that less rain provide may offset that enough for birds to get through the rainy season.

Male Orange-collard Manakin

You can go to Friends of the Osa website for up-to-date weather data or to see maps of Piro Research Center and the Greg Gund Conservation Center and the connectivity between the two areas via our interactive trail maps.

The Gray-headed Tanager (Eucometis penicillata) photograph was taken here near Playa Piro between storms by Friends of the Osa’s Sea Turtle program coordinator Manual Sanchez as he was headed out to the beach for turtle beach patrol.   Sitting under a large palm leaf is probably a good way to keep somewhat dry during a downpour.  The Orange-collared Manakin (Manacus aurantiacus) comes from Gianfranco Gomez at the Drake Bay Rainforest Chalet.

Both birds are common resident species found here on the Osa Peninsula and here at Friends of the Osa.

Birds

Featured Bird: Rufous-tailed Jacamar

Female Rufous-tailed Jacamar

Some might say that the Rufous-tailed Jacamar (Galbula ruficacauda) is reminiscent of a Green-and-Rufous Kingfisher for its similar color patterns and heavy bill whereas others might see this bird and think of it as an oversized hummingbird.   Whatever side you fall on it’s a species that you can’t seem to get enough of and is hard to turn away from for its brilliant colors and sassy attitude.

There are 15 species of jacamar in Tropical America which belong in their own family Galbulidae situated between the puffbirds and toucans.  All belong to the order Piciformes along with woodpeckers and honeyguides.  There are two species found here in Costa Rica, the Great Jacamar (Jacamerops aurea) found on the Caribbean slope and the Rufous-tailed Jacamar found at low elevations on both Caribbean and Pacific slopes.  They are fairly common here on the Osa Peninsula mainly found along forest edges, streams and the open understory of tall second growth forests.  It is also known to frequent cocoa plantations.  We recently saw one perched along a road near one of our avian monitoring points on Friends of the Osa property in an area that we know as Arbolito.  It is not as abundant as some species and so it is a special moment to come across one.

Male Rufous-tailed Jacamar

They measure in at about 9 inches (23 cm) long and weight approximately 27 g.  Those long bills are used for capturing insects.  They perch on horizontal branches swaying their bill back and forth in search of flying insects.  They are known to capture bees and beetles as well as large brilliantly colored butterflies such as Morpho and swallowtails.  Their long beak allows them to grab hold of butterfly bodies while keeping flapping wings as well as bee stings at bay.

Rufous-tailed Jacamars dig long burrows (11-20”) in a bank, the root mass of an upturned tree or a termitary in which to put their nest.  Parents feed their 2 – 4 young during a 3 week nestling period by regurgitating insect parts.  By the time the nestlings are ready to fledge the nest can look like a tomb of glittery insect wings and chitinous body parts.

Birds

Featured Bird: Red-legged Honeycreeper

Red-legged Honeycreeper

The Red-legged Honeycreeper (Cyanerpes cyaneus) can be found here on the Osa Peninsula and can often be seen wandering through humid forest canopies and open areas with its other Honeycreeper relatives the Green Honeycreeper (Chlorophanes spiza), the Shining Honeycreeper (Cyanerpes lucidus) and the Blue Dacnis (Dacnis cayana).  For those novice birders trying to get their bird bearings here in the tropics, one can at first glance mistake the Blue Dacnis or the Shining Honeycreeper for a Red-legged Honeycreeper.  At least I did the first few weeks, but all you have to do is look for the distinctive red legs or the long decurved bill if you’re not yet Dacnis proficient.  Also, one surprise that the Red-legged Honeycreeper has for any onlooker is the bright yellow color of the underneath portion of the wing.

Honeycreepers used to be classified in a separate family with the Bananaquit and flowerpiercers, but are now part of the Tanager family which may seem a bit odd considering their nectar feeding habits and bill morphology.  Any commentaries on why they were lumped with tanagers are welcome here by the way.  But whether you’re a lumper or a splitter, tanagers display more colors and color patterns than any other tropical American bird and Honeycreepers definitely fit the bill.  If you’re not sure what I mean find images of Golden-hooded Tanagers and Bay-headed Tanagers and you will see what I’m saying!

Female Red-legged Honeycreeper

Red-legged Honeycreepers extract nectar from the flowers of Inga, Calliandra and other legume plants.  They also eat small insects, arillate seeds and many other fruits in fairly open edgy areas.  We have seen them moving in mixed-species flocks high up in primary and secondary closed canopy forests as well as right in the gardens of the Osa Biodiversity Center at Friends of the Osa during our early morning avian monitoring point counts.

This species is an open cup nester building a nest of fine rootlets and grass raising two young between February and June.  Pairs are monogamous and both take care of incubation and nesting duties.  Oh, and in case you’re curious Red-legged Honeycreepers weigh about 13.5 grams, about half the size of a House Sparrow.

Visit Photographs by Bob Levy for more beautiful birds of Costa Rica.

Birds

Featured Bird: Chestnut-backed Antbird

Chestnut-backed Antbird. Photo by Alan Dahl

Chestnut-backed Antbirds (Myrmeciza exsul) are common residents of the Osa Peninsula and one of the most abundant species found here.  It is difficult to walk outside here at Friends of the Osa’s Osa Biodiversity Center and not hear two or three individuals counter-singing.  Often times when the rest of the forest has become fairly quiet you can always count on a Chestnut-backed Antbird to let you know that all is as it should be.

The signature look of three species of Antbird found on the Osa Peninsula of Costa Rica is the blue orbital skin (the skin surrounding the eye).  The Chestnut-backed Antbird is one of these species and is distinguished from the others by its slate colored head and chestnut back.  The other antbird that you are likely to see here with the blue orbital skin is the Bicolored Antbird, but it is distinguished by its white neck and belly.

As you can tell by the name, Chestnut-backed Antbirds follow army ant swarms; however, they only do this occasionally and are not considered obligate, or professional, army ant followers.  They are strongly associated with the dark undergrowth of wet tropical forests within dense vegetation especially near overgrown treefalls or dense thickets.  They often join mixed species flocks but won’t necessarily move along the forest with the flock, but will rather join them while ant swarms are moving through the dense thickets in which the Chestnut-backed Antbirds are found.  Once the army ant swarm or the mixed species flock is gone, they will remain in the undergrowth found in their territory.  Many tropical birds follow army ant swarms to pick up insects flushed by the ants, not to eat the ants themselves.  Chestnut-backed Antbirds mainly hop along very low lying perches or along the ground and peck their prey, which mainly consists of insects and spiders from the ground or near the ground vegetation.

Chestnut-backed Antbird. Photo by Gianfranco Gomez

They are territorial throughout the entire year and both the male and female sing duets back and forth to each other and in response to their nearest neighbors.  When disturbed, they will pump their tail downward, droop their wings, and fluff up their feathers.  They nest low in small bushes or debris during the rainy season from April to October.  They usually lay two eggs and both parents incubate and tend to their young.

We would like to thank both Alan Dahl from Focused on Nature and Gianfranco Gomez from the Drake Bay Rainforest Chalet for allowing us to showcase their photographs.

Birds

Featured Bird: White-whiskered Puffbird

White-whiskered Puffbird by Gianfranco Gomez

Not only does the White-whiskered Puffbird (Malacoptila panamensis) rank pretty high on the cuteness scale, it is also an interesting species from an ecological perspective.  Puffbirds are most closely related to jacamars, toucans and woodpeckers.  They are primarily insect and arthropod eaters and are considered to be flycatching birds along with tyrant flycatchers, and nunbirds.  Even though they eat spiders, frogs and lizards taken from the ground they are known for sitting perfectly still in the forest understory until a flying insect meal passes by when it darts out to catch its prey in midair.  It will then take it back to its perch to beat it against the branch before swallowing it.  Their apparent lethargy, as they sit and wait for prey to come by, is really a honed hunting behavior.

You can find either White-necked Puffbirds or White-whiskered Puffbirds here on the trails of Friends of the Osa’s Osa Biodiversity Center between Piro Research Station and the Greg Gund Conservation Center.  Both species separate themselves vertically in the forest.  You’ll find the White-necked Puffbird higher up in the canopy and the White-whiskered Puffbird down low where they don’t directly compete with each other for food resources.  In either case however they are difficult to see for their stealthy style.

Puffbirds build their nests in active termite nests or dig out a burrow in the ground or on the side of a small hillock with a short entrance tunnel with twigs and dead leaves extending out an additional 3 inches.  The actual nest is lined with leaves.  Those that build in termite nests seem to tolerate termites crawling all over them during incubation (From Alexander Skutch’s book of Birds of Tropical America, 1983).  Ground burrows can be as long as 22 inches.

So why are they called puffbirds?  As you can see from the photo, they are stout birds with fairly large heads and their feathers have a puffed-out appearance.  When they get excited they puff out and swing their tail back and forth.  Their abundant puffy plumage makes their short legs almost invisible.  Note the striking red eyes as well!

We would like to thank Gianfranco Gomez for allowing us to showcase his photographs.  You can find more of his work at The Drake Bay Rainforest Chalet website.

Birds

Featured Bird: Common Pauraque

Common Pauraque by Karen Leavelle

Have you ever been out at night driving along a country road and been startled by red ember eyes darting across the hood of the car, and then to have it happen every few hundred meters or so?  If you are driving anywhere on roads, especially dirt roads, from South Texas on down to Argentina you are bound to see the Common Pauraque (Nyctidromus albicollis).

Here on the Osa Peninsula on the road to the Osa Biodiversity Center it is a common sight to see the nocturnal nightjar hunting along these roads or other open areas at dusk, dawn or during the night.  As twilight approaches, Pauraques will position themselves on the ground which is a good spot from which to see insects backlit against the night sky, or on a favorite perch sallying around in search of the nights meal.

They have very small beaks yet large gaping mouths with which to scoop up large insects such as beetles, moths and fireflies.  The bristles around the face resembling whiskers are modified feathers which are highly tactile and controlled by muscles and are used to help hunt insects at night.  They are likely there to also keep out-of-control insect legs and wings out of the bird’s eyes!  This 11” (28cm) bird also has low wing loading which means their body is proportionally small to their large wings which makes them powerful flyers through wooded areas especially at night.

The genus Nyctidromus gives the Common Pauraque its first name “night runner” describing its nighttime ground foraging behavior and the species name albicollis is in reference to its white throat patch.  In various parts of Central America it is commonly refered to as “Don Pucuyo” or “Caballero de la noche” for its association with love.  Some parts of Costa Rica call this species “Tapacaminos comun” meaning common road coverer.  Here on the Osa Peninusla it is known as Cuyeo.  There is lots of legend surrounding this and other nighthawk (goatsucker) species related to both love and darkness.

Its cryptic browns, tans and buff coloration make this bird hard to see unless you are about to step on it.  It will flatten itself close to the ground when danger approaches and then will flush at the last moment.  It will then keep its eyes slightly open as you can see from the photograph to keep an eye on the possible ensuing predator.  It places its nest of two eggs right on the ground with no pomp or circumstance usually in shady wooded areas.

So why hunt from a country road exactly?  Studies have shown that Pauraques will actually sit along the side facing the road and are more likely to be found there during a full moon which reflects light on the dirt surface making it easier to find and catch insects.

You can find this and other photographs from Alan Dahl at Focused on Nature.  The light morph bird was taken by me along the trail up on our Arbolito property just last week early August.  This bird flushed from my feet and was very cooperative with her photo shoot allowing me to get quite close so I could bring you her image today.

Birds

Featured Bird: Blue-crowned Motmot

Blue-crowned Motmot by Alan Dahl

The Blue-crowned Motmots (Momotus momota) have been spending a lot of time around a Nance tree (Byrsonima crassifolia), a prolific fruit producing tree in the garden here at Friends of the Osa’s Osa Biodiversity Center.  Lately there have been quite a few hanging around giving their distinctive soft low pitch “moot moot” call at dawn which has sounded like a large choral group, each bird with its own perfectly timed solo, and the group never missing a beat.  With the Nance fruiting right next to the house, one of them actually flew through the front door the other day making me realize that it was time to share this species with you on the blog.  Oh and by the way, he or she did find its way out of the house fairly quickly.

In this species the male and female look alike and as you can see from Alan Dahl’s photograph, they are brilliantly colored.  Motmots in general have two very distinct features worth noting: the racquet-shaped tail and a heavily serrated bill.  The tail is more than half the birds total length and has two long central feathers.  During feather preening sections of the tail barbs fall off leaving the exposed vane.  The tip of the feather or the racquet remains intact forming what looks like a racquet head.  Motmots are famous for slowly and methodically swinging their tail feather back and forth like a pendulum.

The bill has tooth like serrations allowing them to take small snakes and lizards as well as other insects and tear them apart.  They also accompany army ant swarms picking off what the other birds kick-up from the ground.  And yes, they like fruit.

A third and very interesting characteristic of the Motmot is the fact that they dig their nest into burrows.  They are most closely related to Kingfishes and todies which also dig into burrows.  Motmots excavate tunnels in the bank of a road or stream or in the side of a pit or hollow in the ground.  Their nests are unlined and can wind as far back as 5 – 14 feet (1.5 – 4 meters).  Now I don’t know about you all but I have a hard time seeing such a beautiful majestic bird digging a long tunnel in the dirt and coming out looking that good, but I truly hope to see it someday.

You can see the Blue-crowned Motmot all over Costa Rica, and at least at the moment, all over Cerro Osa on the Osa Peninsula.  You can also find them from Mexico down through Argentina and in just about any type of habitat most often perched in the shade saying “moot moot, moot moot”!

We would like to thank Alan Dahl for allowing us to showcase his photographs.  You can find his work at Focused On Nature.

Birds

Featured Bird: Violaceous Trogon

Violaceous Trogon by Tyler Reynolds

This week’s bird, the Violaceous Trogon (Trogon violaceus) jumped out at me (not literally) as I was having my morning coffee on my front porch here at Friends of the Osa’s Osa Biodiversity Center on Cerro Osa.   I was watching all the typical dawn action, mainly the Tropical Kingbirds and Gray-capped Flycatchers being overly vociferous when I saw another yellow bellied bird perched calmly on a Virola tree branch.  This particular belly though was accompanied by a violet head, a beautiful long black and white barred tail and the distinctive yellow eye ring of the Violaceous Trogon.  The female Violaceous is distinguished from her mate by her gray head and elliptical eye ring.  I have since noticed that this male trogon as of late is always perched on that same branch every morning in its upright posture, not for long, but long enough for me to finish my coffee and get a good look.

There are 40 trogon species in the warm regions of the world, ten of which are found in Costa Rica.  Four species can be found here on the Osa Peninsula: the Black-throated Trogon, the Slaty-tailed Trogon, Baird’s Trogon and the Violaceous Trogon.  You can see all four species here on Friends of the Osa properties.  You just have to look very carefully as they can be somewhat still.

You can find them in wet lowland forest and also along edges and open areas.  They will hover to pluck fruit or insects from the vegetation and are known to eat wasps.  In fact, Violaceous Trogons have been known to nest inside wasp nests, termite nests and arboreal nests of Azteca ants.  Naturalist Alexander Skutch observed a pair actually nesting inside a wasp nest (vespiary).  The Trogons built their own nest inside the vespiary in the early morning hours before the wasps became active.  During the day the Trogons would hunt the wasps taking them from the air or from the surface of the vespiary.  Interestingly, the wasps never drove the Trogons from their nest nor did the Trogons ever eliminate all the wasps, but they did successfully fledge young.

You can find the Violaceous Trogon on either coastal slope of Costa Rica and it ranges from Mexico down through Amazonian Brazil.  And yes, for those of you who may be wondering, the Resplendent Quetzal is also in the Trogon family and found in the Tilaran, Central and Talamanca Cordilleras here in Costa Rica.

Keep an eye out down the road as I will also devote a page to the Baird’s Trogon since it is endemic to Costa Rica and Panama and vulnerable to extinction according to International Union for Conservation of Nature (IUCN).

This week’s photograph was taken here on the Cerro Osa property just today by Friends of the Osa’s Tyler Reynolds.