(I overhear a group of teenagers talking while looking at the penguin exhibit.)

Teenager 1: “What exactly is a penguin?”

Teenager 2: “Are you that stupid? A penguin is a fish!”

Teenager 2: “No. A penguin is an amphibian. You know, like frogs.”

Teenager 1: “You know guys I think penguins are mammals, because they got fur. ”

Me: *addressing everybody at exhibit* “The penguin is a unique bird that can ‘fly’ in the water.”

Teenager 2: *after looking at his friends in awe* “I still think it’s a fish.”

Related:
Early Bird Brained
Bird Brained
Bird Brained, Part 2
Bird Brained, Part 3
Bird Brained, Part 4
Bird Brained, Part 5
Bird Brained, Part 6