An organism, when in the morning has 4 legs, when at noon it has 2 legs, and when in the evening it has 3 legs. what is it?

The answer to this tricky question is human being. In this question, morning represents the child or the early age of the human. So in the early age or during the time when a human being is a baby it crawls on its all fours. The noon represent the middle age of the person when he or she walks on their both legs. At night or in the old age a human being walks on their two legs and takes the support of a cane which acts as the third leg.