In Swedish we say "dum som en gås" stupid as a goose "stolt som en tupp" proud as a rooster "flitig som en myra" hardworking as an ant.
also sometimes "klok som en pudel" wise as a poodle, "IQ fiskmås" IQ seagull, and "trött som ett lejon" sleepy as a lion but these are local to my dialect and sociolect maybe.
I know that in French a pintade is supposed to be stupid.
What are some more?