re: legs
Man-because he crawls on all fours as a baby, then walks on two feet as an adult, and walks with a cane in old age.
The Greek Sphinx was the one who asked this riddle to all travelers
re: legs
Humans. Morning is when your a baby, crawling on your legs and hands, midday is in the middle of your life, where you walk with your legs and afternoon is when your old and use a cane as a "third leg
duno wot?