Gilacorn

Gilacorns are small, lizard-like creatures that scavenge the desert, looking for food. Only the diminutive version of these animals are alive today.

History
In the Si Wong Desert, one of these creatures stole an egg that Appa was attempting to eat. After finding an egg in a nest, Appa was ambushed by the creature, who grabbed the egg and quickly retreated, likely terrified of Appa's gigantic stature.

Anatomy
Gilacorns, also known as "poisonous lizards", are equipped with a whimsical, yet deadly, unicorn horn. They walk on their back legs like a basilisk lizard or a mongoose dragon, which can both walk on the surface of water. It is unknown if the gilacorn is also able to walk on water.

Behavior
Known to be the nanny-goats of the desert, these things eat anything except Sour Beetles. They seem to be like the prehistoric oviraptor, an egg-stealing dinosaur, as the lizard was seen stealing an egg from Appa just before the sky bison was able to eat it. These creatures will eat anything, except sour beetles.

Trivia

 * Part of the namesake of the gilacorn is the gila monster. Unlike its real-world counterpart, the gilacorn is somewhat smaller and faster.
 * They are known as the nanny-goats of the desert.
 * Only the diminutive version survives today.