what animal walked on four legs, two legs ,then three legs?

baby crawling

man walking upright

old man with a cane

It's not an animal, it's a riddle from Greek mythology. The answer is a man. When he is a child, he crawls on all fours. when he is a man he walks on two feet. And when he is an old man he needs a cane. Thereby needing three legs.

Four: Baby

Two: Man/Woman

Three: Old Man on a cane/Old Woman on a cane

A human.

The human starts out as a baby crawling.

Then the baby begins to walk upright.

Then when the baby grows up and into an old person, he/she uses a cane.

Man

Four legs as a baby.

Two legs as adult.

Three legs in old age. (two legs + cane)

Human.... baby crawls on fours, when at age one or two he starts walking until the age of 60 or 70, when he'll have to use a stick to support himself....

humans

babies crawl

people walk

elderly need canes which is a "third" leg

man....... crawls as a baby walks as a young man uses a cane as an old man