It first appeared in At the Earth's Core. Snakes - Venomous vipers which the characters use to make poisoned arrows. They first appeared in At the Earth's Core. Stegosaurus (Dyrodor) - A carnivorous variety that able to manipulate its back plates to allow it to glide (unlike a real Stegosaurus). Tapir - Pellucidarian name unknown. Trachodon - Pellucidarian name unknown. Triceratops (Gyor) - An ill tempered dinosaur similar to the Gryf of Pal-ul-don, however it is a herbivore unlike it evolved counterpart on the Surface. They are often hunted by Horibs. Trodon - Pellucidarian name for a creature with no outer world equivalent. The Trodon are dragon-like flying reptiles with pouches similar to those of kangaroos. Not to be confused with the Troodon, an actual dinosaur. It first appeared in Back to the Stone Age where it carried Von Horst to its nest in the crater of a dead volcano. Troodon - Pellucidarian name unknown. Tylosaurus - Pellucidarian name unknown. Tyrannosaurus (Zarith) - The Tyrannosaurus are one of the dominant predators in Pellucidar. Von Horst and La-Ja encountered a juvenile specimen the Forest of Death, and was about to devour a Gorbus, a member of a weird, cruel, albino race. Von Horst was able to kill the beast. La-Ja informs him that adult zarith feed on the giant Bos, the aurochs, and on the mighty mammoth. Whales (referred to as "Herbivorous Cetaceans" by Perry) - The whales of Pellucidar weigh around four to five pounds, are vegetarian and brightly colored, and reside in bodies of fresh water instead of salt water, as whales do in the outer world. They first appeared in At the Earth's Core. Woolly mammoth (Tandor) - It first appeared in At the Earth's Core. Some woolly mammoths are used as mounts by a tribe of natives called the Mammoth Men. Woolly rhinoceros (Sadok) - It first appeared in At the Earth's Core. Races and tribes Pellucidar is also inhabited by enclaves of various non-human or semi-human races one of whom are the stone age humans of the inner world. Among the known races and tribes in Pellucidar are: Ape-Men - A race of black-skinned creatures with prehensile tails, receding foreheads, long arms, and short legs who are arboreal in nature. They are known for domesticating goats and Hyaenodons. Azarians - A race of 7 ft. primitive man-eating giants with ugly faces and yellow tusk-like teeth. Brute-Men