a person, animal, or thing that howls.

Also called howler monkey. any large, prehensile-tailed tropical American monkey of the genus Alouatta, the males of which make a howling noise

some species are endangered.

a mistake, esp. an embarrassing one in speech or writing, that evokes laughter; a very humorous mistake or a funny blunder.

Informal . something that makes a piercing and often prolonged noise, as an alarm.