In the wild, all organisms must live within their niche. There are no wild polar bears in Arizona, and no iguanas in Alaska.
Scientists clash over how to measure animal intelligence: brain volume, brain organization, numbers of neurons…?
Penguins have no external genitalia. Even as adults, the males and females can be difficult to tell apart.
Don’t kick sand in the face of a wildebeest by joking that it looks like it was made by a committee. It might flex its muscles and charge.