...Mammalia - Theria - Eutheria - Ungulata - Perissodactyla, Hyracoidea, Proboscidea, and Sirenia

Don't get in the way of a black rhino charge - Ultimate Killers - BBC Wildlife
Meet the endangered Hyrax - Little brother of the elephant -BBC
Elephant babies learning to drink - BBC (start at 1:20)
Elephants at Play
What in the world is a dugong?

Gentle Manatees by Kathleen Martin-James
Elephants by Louise Martin
World of Animals: Mammals: Large Carnivores by Pat Morris and Amy-Jane Beer
Mammals by DK - Smithosonian Handbooks
The Simon & Schuster Encyclopedia of Dinosaurs & Prehistoric Creatures

Vocabulary Added:
perissodactyla: uneven-toe
hyracoidea: shrewmouse-type
proboscidea: proboscis-forms
sirenia: sirens

Activity:
Draw and label an animal from each family
Add rhinoceros, hyrax, elephant, and manatee to the Animal Tree