The Black-and-yellow Silky-flycatcher is one of the four species in a unique family around the world, with the Long-tailed Silky-flycatcher being the only other species to be seen in Costa Rica. The male shows a combination of yellow rump, chest and undersides, with gray belly and vent; its throat and head it black, as well as it tail and wings. The Female has a gray throat with a black cap, olive chest, wings and tail. Their shape is similar to other Costa Rica thrushes, as they look rather plump when compared with the Long-tailed. Although Flycatchers by name, they prefer to eat fruits, specializing in berries that are abundant in the highlands; indeed their range is restricted to Guanacaste, Tilaran, Central and Talamanca Cordilleras. They are endemic to Costa Rica and western Panama, thanks to the fact that the Talamanca Cordillera stretches out into Panama.
The White-collared Seedeater is very similar in shape to the common Variable Seedeater, and the male particularly resembles the Pacific race of the latter species. As with most seedeaters, the female is brown, but with a lighter color than other species. The male has a wide white collar around the neck, while the Pacific race of the Variable Seedeater has a thin line that does not join in the back of the neck and shows a black throat. The White-collared has wing bars, which no other seedeater in Costa Rica posses. Both species can be readily found in open pastures, where they share their main habitat and compete for food, specially grass seeds. Seedeaters tend to not gain the attention of most birders, but I believe this is the most beautiful seedeater species that we can see in Costa Rica. This individual stood on the fence wire as we drove through Boca Tapada; the picture was taken from the car window.
The Black-headed Saltator has a grey belly, black and whitish throat, white supercilliary and olive upperparts. It can be confused with the smaller Buff-throated Saltator however the Black-headed does have a black nape and white throat, which is very distinctive, and their songs are different. This species is very wary of humans, and although they approach fruit feeders, they make it hesitantly. At the first sign of human presence, they will fly away.
The Acorn Woodpecker is one of Costa Rica’s largest species, only topped in length by the Lineated and Pale-billed Woodpeckers. The funny-looking pattern on its face earns it the local name “little clown”, with a conspicuous red crown, and a black and yellowish-white mask that cover the face and throat. The iris is almost white, and the bill is black. While the back and wings are entirely black, the chest has black and white streaking, and the belly is white. The female can be identified by a small black patch on the front of the crown, whereas the male’s crown is entirely red. Their inhabit the highlands, particularly Cerro de la Muerte (Buenavista) and Cordillera de Talamanca, where they are very common. Their call display is also very showy when compared with other Costa Rica woodpeckers, swinging their body from one side to the other while giving their calls away.
The Large-footed Finch is large in comparison with most other species in the finch family. They prefer to stay on the ground, and at first might resemble small chickens due to their common behavior of scratching the leaf litter for food with their legs. Their overall color is olive, with a gray head and black face; also note the black strips running from the face to the back of the neck. Their main habitat is the highlands at Central (Volcan Barva, Cerro Buenavista) and Talamanca cordilleras. It delivers a song at intervals, composed of high-pitched whistles.
The Smooth-skinned Toad (or Leaf-Litter Toad as it is called sometimes) is a species of true toad that bears a dead-leaf pattern on its skin, concealing it from most predators when they lie motionless in tree bark or the ground. Furthermore, their lifestyle is nocturnal, so during the day they don’t move much, unless spooked. They rely on that camouflage to be safe, even around streams, where their dull colors can match the colors of some rocks. They are small, around the size of a female Green and Black Poison Dart Frog, but their overall coloration is a dull brown with orange and dark blue patches, making them incospicuous against the brown layer of leaf litter.
The Green and Black Poison Dart Frog is one of the species in this family that occurs in Costa Rica, along with the Strawberry Poison Dart Frog and other species, although this species is bigger than the Strawberry. Poison Dart Frogs are diurnal, so it is relatively common to flush them from the floor litter during hiking trips through forested areas. Their contrasting body color is an adaptation meant to signal their poisonous skin to potential predators, helping these frogs escape from danger. Poison Dart Frogs are known because of their ability to withstand ant venom and convert it into their own which means the older the frog, the more poisonous it becomes. Some of these species were used by aboriginal people in South America to kill monkeys and other prey, by rubbing their skin to the arrows that they shoot.
It is normal to see Poison Dart Frogs resting on the leaves of bromeliads, where they usually deposit their larvae, which will develop inside a water pool in the base of a bromeliad leaf. They are more conspicuous when seen on leaf litter, which usually turns brown as the vegetation decays. Also poisonous species like this one are more active during the day. The two times I have had the opportunity to photograph this species, I was careful to keep my distance, as they jumped around quickly and could touch me at any moment. While being touched generally won´t produce any reaction, being careless afterwards and bringing the hands to touch the eyes or the nose after having grabbed one of these can produce significant effects, up to partial blindness.
The White-line Tanager has strong dymorphism, with the male being black with a small white line on the shoulder, and the female being entirely rufous. They normally forage in pairs, which helps in identifying them. Males can look very much like Scarlet-rumped Tanagers when the rump is not visible, but the bill is gray instead of blueish. The female is also similar to the Scarlet-rumped, however it has no marks and a black bill. They also approach fruit feeders but are more wary than Scarlet-rumped preferring to forage in the dense vegetation.
The Spotted Antbird is part of the family of birds that usually follow army ant raids, grabbing insects that flee from the ants. Their backs have an orange color, along with the wings which are also patterned with black. The head of the male is dark gray, while in the female it has a brown coloration. The chest features spots of black on a white chest, and then the underside is light gray. It is rather small when compared with other antbirds. I found a group of five males that were singing at the edge of the trail in Observatory Lodge during the afternoon, along with three Bicolored and one Ocellated Antbird. That was quite a show as they jumped from one place to another on the ground.
The American Oystercatcher is the only species that reaches Costa Rica, out of 12 species that compose the family Oystercatcher family. They are all very similar, mainly varying in terms of their plumage color. The American species has a brown-gray back, white underparts, pink legs and black head. The eye is yellow with surrounding orange orbital skin, and the bill is large and slim, orange in coloration, which is used to grab and eat shellfish. The inner plumage of the wing is also white, and is shown during flight, or also during displays when wading in the shallow water.
Due to their peculiar look, they are easy to identify among flocks of migratory birds, which normally are composed of gulls, terns, plovers and sandpipers, but are not as abundant during migration and any of those families. They are among the largest of such migratory bird groups. They prefer mud and salt flats that are exposed and shallow, where they can wade to grab prey. They feed by either severing the muscles that enable the mollusks to close tight, hereby getting the meaty interior out, or by grabbing the entire body with the shell, and hitting it against rocks to slam it open.