Horned Screamer
These birds are the unicorns of the bird world. They’re more closely related to swans and geese, hence their massive size. Despite their size, it’s more likely you’ll hear them before you see them, and it’s all thanks to their loud, echoing call. They’re mostly black with white specks and have a horn-like structure that sticks out of their crown. Besides their calls, it makes them incredibly unique. It’s loosely attached to their skull and grows and breaks continuously, once it gets too long, similar to human nails. They don’t use their horn as a weapon, and scientists believe it’s for more of an ornamental purpose than anything else (National Geographic).