Sphinx, in Greek mythology, monster with the head and breasts of a woman, the body of a lion, and the wings of a bird. Lying crouched on a rock, she accosted all who were about to enter the city of Thebes by asking them a riddle, “What is it that has four feet in the morning, two at noon, and three at night?” If they could not solve the riddle, she killed them. When the hero Oedipus solved the riddle by answering, “Man, who crawls on four limbs as a baby, walks upright on two as an adult, and walks with the aid of a stick in old age,” the sphinx killed herself. For ridding them of this terrible monster, the Thebans made Oedipus their king.

In ancient Egypt, sphinxes were statues representing deities, with the body of a lion and the head of some other animal or of man, frequently a likeness of the king. The most famous of all Egyptian sphinxes is the Great Sphinx of Giza, near the pyramids. Dating from around 2500 bc, the Great Sphinx is about 20 m (about 66 ft) high and about 73 m (about 240 ft) long.