Why did the ??? cross the road?

The Best Animal Jokes:-

Why did the chicken ... jokes are pretty international. Perhaps because chickens are slightly comical.

The original joke, wasn't really very funny: It was mentioned in print in 1847, in The Knickerbocker, a New York City monthly magazine:

...There are 'quips and quillets' which seem actual conundrums, but yet are none. Of such is this: 'Why does a chicken cross the street?['] Are you 'out of town?' Do you 'give it up?' Well, then: 'Because it wants to get on the other side!'

Nowadays you are more likely to see: Q. "Why did the chicken cross the road?" A. "To get to the other side". It is sort of anti-humor. The joke is a set up, where you expect a traditional punchline, but the answer is a simple statement of fact.

These jokes are now a bit of a legend, and have been expanded to include other critters. Here are a few:-