A baby hawk is called an eyass (or eyas) — one of the most unique baby animal names in English. When it leaves the nest, it becomes a brancher, then a fledgling.
"Eyass" comes from Old French "niais" — meaning naive/foolish
Older siblings sometimes kill younger ones (siblicide)
Parents drop dead prey into the nest for eyasses to eat
Branchers walk out of the nest onto branches before flying
Red-tailed hawk eyasses practice hunting with grass and sticks
Eyes change from gray to yellow to dark brown as they mature
First-year hawks have different plumage than adults
Falconers specifically use the term "eyass" for captive-bred birds