Here's another riddle: What walks on four legs in the morning, two in the afternoon and three at night?

A human!!

The human, and here's why:

When you're born, you first learn to crawl: hands and knees = four legs
When you learn to walk, you're upright: legs = two legs
And when you're old, you use a cane: legs plus cane = three legs

:-)

Human :D

Man.

just like grace_v