Mammals of the pliocene era: warm-blooded,
milk-producing animals. Their skin is covered with hair or fur and they
are usually viviparous.
Mammoth: enormous, wooly-coated ancestor of the elephant.
Straight-horned bison: enormous ancestor of the bison,
with an immense pair of horns.
Sabre-toothed tiger: large fanged predator, ancestor of the tiger.
Wooly rhinoceros: wooly-coated ancestor of the rhinoceros.
Giant short-faced bear: giant ancestor of the brown bear.