Greek mythology to dominance is frequently called the "Dorian invasion". The Lydian and later the Macedonian kings, as rulers of the same rank, also became Heracleidae. Other members of this earliest generation of heroes such as Perseus, Deucalion, Theseus and Bellerophon, have many traits in common with Heracles. Like him, their exploits are solitary, fantastic and border on fairy tale, as they slay monsters such as the Chimera and Medusa. Bellerophon's adventures are commonplace types, similar to the adventures of Heracles and Theseus. Sending a hero to his presumed death is also a recurrent theme of this early heroic tradition, used in
Sheep–goat chimera from the sheep embryo (i.e., whichever germ-line formed the ovaries or testes). The term "shoat" is sometimes used for sheepgoat hybrids and chimeras, but that term more conventionally means a young piglet. The most convenient way of identifying a geep is to simply look at the animal's tail. A geep's tail extends horizontally from the base of the spine combining the characteristics of a sheep's and goat's tail. Sheep–goat chimera A sheep–goat chimera (sometimes called a geep in popular media) is a chimera produced by combining the embryos of a goat and a sheep; the resulting animal has cells of