Help find the answer to the riddle of the sphinx?

There is no riddle of the Sphinx,

the question/ riddle is what walks on four legs in the morning, two legs at midday and three legs in the evening.

the answer would be a human. as in the morning of someones life they are a baby or toddler, so they would crawl on four legs, at midday it refers to an adult ( who walks on two legs ) while in the evening the human is old and uses a walking stick ( equals three legs ) .

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There IS a riddle of the Sphinx. Created in Oedipus when Oedipus needed to get to Thebes, he came across a Sphinx blocking his path who asked him this riddle. He gave the correct answer and went on.