What is a burro?

A burro is an ordinary, standard sized donkey in most of the western United States. It's the Spanish for donkey, but expanded beyond Spanish (as did some of the American terms for horse colors). There are some "wild" (feral) burros in the desert southwest. Technically a female burro is a burra, but the word burro is commonly used for both sexes.

Image source Adrian Pingstone via Wikimedia Commons.