One of the most special experiences we had was a trek to see the Oilbirds at Asa Wright. These almost mythical birds are the only nocturnal flying fruit-eating birds in the world, using a combination of echolocation (just like bats!) and specially adapted eyesight to navigate in the dark. They live in caves, and produce the most guttural, haunting sounds you can imagine. Visiting the cave is a surreal experience, to say the least!