Other forms: zoologically
Anything zoological is about animals. It’s logical that you’d use the word at a zoo, where critters and beasts hang out.
This is an easy word to remember if you think about zoos. In fact, zoo is short for Zoological Gardens, the first of which was created by the London Zoological Society to house the society’s wild animals. Zoo comes from the Greek word for animal, zoion, plus -ology for “the study of” and then -ical, an ending that makes the word an adjective. If you’re describing something that has to do with the study of animals, zoological is your word.