Guarding the entrance to Thebes, the Sphinx asked all who passed by a riddle, and devoured those that couldn't answer correctly.

Nemean Lion

Like many of Typhon and Echidna's brood, the Nemean Lion was raised by Hera and set loose upon some poor village, then was later placed in the stars by the goddess after it was killed by the hero Hercules.

The Nemean Lion's hide was impervious to all weapons, and the monster had to be strangled to death (still no easy task, as Hercules lost a finger during the fight in one account). Not letting a good thing go to waste, Hercules wore the lion's skin as armor, which became one of the hero's trademark attributes.

Colchian Dragon

The guardian of the Golden Fleece at Colchis, the Colchian Dragon kept constant watch, never resting for even a moment (although it could be forced to with music or magic).

Caucasian Eagle

For stealing fire from the gods and giving it the mortals, the Titan Prometheus was punished by having his ever-regenerating liver eaten daily by the Caucasian Eagle ("caucasian" here meaning "of the Caucasus", specifically the Caucasus Mountains, where the punishment took place).

The Eagle itself has two different origins: a flesh-and-blood monster offspring of Typhon and Echidna, a bronze automaton created by the smith-god Hephaestus.