Chimera

The Chimera (Greek: Χίμαιρα, Khimaira, from χίμαρος, khimaros, "she-goat", also spelt 'Chimaera') is the son/daughter of Echidna and Typhon. It has the head of a lion, the body of a goat, and a snake-headed tail that secretes deadly venom released through a bite. In some myths it was portrayed as female, while in the book it is male.

History
In ancient myths, the Chimera was killed by Bellerphon on Pegasus when Bellerphon jammed a lead ball into its mouth. The ball melted, killing it with lead poisoning.

The Lightning Thief
In The Lightning Thief, Percy Jackson is cornered by a fat lady and her chihuahua at the top of the St. Louis Gateway Arch. The lady constantly refers to her pet as "sonny" or "son" and it is only when Percy is forced to wait for a second elevator down and left without the company of Grover Underwood and Annabeth Chase that he discovers who the fat lady really is (Echidna, mother of all monsters).

The chihuahua transforms into his true form, that of the Chimera, and attacks Percy. As Percy tries to defend himself and a few innocent bystanders with Riptide, he is outwitted by the creature and ultimately forced to dive out of the Gateway Arch (via a hole conveniently provided by the Chimera) into the Mississippi after being poisoned by the snake-headed tail.

Powers
The Chimera has many powers including:


 * It can breathe fire.
 * Its snake-headed tail has venomous fangs and excretes a venom that 'is like acid'
 * It has human intellegence.

Trivia

 * In The Lightning Thief film, the part where Percy and his friends encounter Chimera and Echidna was replaced with them fighting the Hydra at a replica of the Parthenon in Tennessee.