Mr. Cyrus Q. Hornbill is Adam and Jake's homeroom teacher, an Indian Rhinoceros, who also teaches math, science and geography. He appears to have a crush on the cafeteria lady, Mrs. Eugenia Tusk. Ironically, despite being a herbivore, he mainly teaches classes on hunting and stalking prey. He is the weakest of the teachers, who couldn't beat a small toad in wrestling, nor drive away a taunting bird named Ted who decided to stand on Cyrus' horn. Voiced by Maurice LaMarche.

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