Animals by trainable intelligence

Simple:

 * Uintatherium

Intermediate:

 * Arthropleura
 * Aurochs
 * Dinornis
 * Doedicurus
 * Gigantophis
 * Macrauchenia
 * Megaloceros
 * Meganeura
 * Palaeeudyptes
 * Sivatherium
 * Titanis
 * Titanoboa

Advanced:

 * Andrewsarchus
 * Castoroides
 * Chalicotherium
 * Daeodon
 * Deinotherium
 * Dinocrocuta
 * Dinopithecus
 * Diprotodon
 * Elasmotherium
 * Enhydriodon
 * Gigantopithecus
 * Gomphotaria
 * Josephoartigasia
 * Megalania
 * Megalochelys
 * Paraceratherium
 * Platybelodon
 * Procoptodon
 * Pulmonoscorpius
 * Purussaurus
 * Quinkana
 * Short-faced Bear
 * Smilodon
 * Woolly Mammoth
 * Zygolophodon