Yellow billed cuckoos are a rather rare intake at our rehab center, I've only seen a few while working there. When we do get them though, they're delightful birds to have around. In their prefledgling stage, they can be easily recognized amongest the other featherless jellybeans by large white bumps on the roof of their mouth. It's a bit horrifying at first, looks like it has some sort of terminal disease, but that's just how they look. It's beleived to help them win the attention of mother birds in the nest so they get fed more. An important note, cuckoos are nest parasites, which means their mothers just lay the egg in a random nest and split. A little unfair, but none of the birds at our facility are being cared for by their real parents anyways. Cuckoos typically eat very well, perhaps in part due to low standards for parental recognition. Most get finicky with age, but we had one that refused to be seen feeding itself for as long as possible to make sure it didn't have to stop getting fed. He was quite a character, stole a pair of feeding tongs once and flew around the room with them. They have an air of intelligence about them, they look at you with curiosity in their eyes. Fortunately they're a bit clumsy while they're young, so their curiosity doesn't get them into too much trouble.