Page 12 - Mammal (DK Eyewitness)

WHALES AND DOLPHINS (Cetacea)
Toothed whales, baleen (whalebone) whales, dolphins, porpoises.
About 78 species
Skull shown: Spinner dolphin
See also pp. 29, 42, 50-51
Whale

ODD-TOED HOOFED MAMMALS (Perissodactyla)
Horses, asses, zebras, rhinos, tapirs.
17 species
Skull shown: Brazilian tapir
See also pp. 23, 27, 28, 36, 44,
46, 50, 58

Tapir

Deer
EVEN-TOED HOOFED
MAMMALS (Artiodactyla)
Includes hippos, pigs,
peccaries, camels, llamas,
giraffes, deer, chevrotains,
gazelles, antelopes, cattle, Hyrax
sheep, goats.
About 220 species
Skull shown: Goitered gazelle HYRAXES (Hyracoidea) Seal
See also pp. 3, 16, 20-21, 27, Bush hyraxes, tree hyraxes,
28, 35, 48, 58, 63 rock hyraxes, dassies.
7 species
Skull shown: Southern tree
hyrax
See also pp. 58

SIMILAR STREAMLINED SHAPES
Body shapes can be misleading. A seal and a
manatee look similar - because they both live in water and have
evolved a streamlined shape for swimming (convergent evolution).
But their teeth, digestive systems, and other internal structures show
that they are quite different and therefore placed in different orders.

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