Ejem EJEM… *deep breath*
Oilbirds are strange but pretty adorable creatures, complete with smiley eyes and whiskers, but also with a pretty grisly history. These South American bat-like birds are technically called guácharo but nicknamed "oilbirds" because when they are young, the chubby little chicks are super plump with oily fat. Even as they grow up, the birds tend to stay on the large side.
Historically, indigenous peoples in Venezuela would go each year into caves for something they called the oil harvest. They would use long poles to destroy the nests, getting down the injured and dead baby oilbirds. Then, the oily fat from the chicks was then used to flavor food, and even fuel torches and fire