The Black-necked Stilt is a wader bird, meaning it walks in shallow waters, looking for small prey to snatch. It does not dive and is not usually seen swimming. The stilt has a streamlined body and extremely long pink legs, allowing it to wade in deeper waters than other, smaller waders found in Costa Rica like the Plovers and Sandpipers. It has a contrasting black and white body. When startled, they usually fly away in a wide circle and return to a similar place they were before.
The King Vulture is a really magnificent bird. The other three species are black in general, with different color of head and neck. The Black Vulture is commonly seen soaring around the country, but the King Vulture is not seen that often. However, when you see it, you are amazed. The juvenile is mostly black, with white underparts, while the adult is mostly white, with black wing secondaries and orange to red neck. Both have white irises, which contrasts nicely with the head colors. Immature adults retain some of the black feathers from the juvenile stage, showing an intermediate color pattern. The pink maw protrudes from the chest´s feather and is a very conspicuous feature, specially when the individual is full of eating meat. I am supposing that during hot days it helps to cool off by having it outside of the feathers.
The Northern Jacana is a waterbird that inhabits swamps and marshes, where the water is not too deep. The bird walks in the shallows, looking for small fish and crustaceans. It can even walk over some water plants whose leafs are big enough to sustain this delicate bird, thanks to very long toes that help to distribute the weight across a greater extent of water surface. Another unique behavior is its polyandrous nature, meaning that females will mate with many males, and it is the males that prepare the nest and care for the eggs and chicks. It is brown overall with black throat and head, with a yellow shield on the front (Wattled Jacana’s and Common Gallinules have a red shield). The juvenile has white underparts and lacks the shield seen in the adult.