Pigs: 8 species
Pigs have a stocky body with a long head and mobile snout used for rooting, and sparse, bristly hair. They have a simple stomach, and eat both plant and animal food. Both their upper and lower tusk-like canine teeth point upwards. There are four toes on each foot, but the two central toes are the largest.
Peccaries: 2 species
Gregarious pig-like mammals from Central and South America, peccaries also have some ruminant characteristics: a fairly complex stomach, united third and fourth foot bones (these are separate in pigs) and tusk-like canines that point downwards and not upwards as in pigs.
Hippopotamuses: 2 species
These animals are good swimmers and divers. Their large, heavy, short-legged bodies have a thick layer of fat under the skin, and their slightly webbed feet have four toes. The bulls fight, using their tusk-like lower canines as weapons.
Camels: 3 wild species
Camels and llamas have only two functional toes, supported by expanded pads for walking on sand or snow. The slender snout bears a cleft upper lip.
Chevrotains: 4 species
Chevrotains, also called mouse deer, are very small ruminants without horns. They have three-chambered stomachs, and the males have long, tusk-like canine teeth. They live in the tropical forests of Africa and southern Asia.
Deer: 40 species
Most male deer grow branched antlers - bony outgrowths of the skull covered with velvet (furry skin) during growth. Antler growth stops before the mating season and the velvet is then shed. Antlers are shed after the mating season. The smaller, more delicately built females do not generally have antlers.
Cattle and antelopes: 110 species
Bovids have horns with bony cores which grow hard sheaths of horny material. The horns, which are unbranched, are never shed; the sheath is constantly renewed from inside. Most bovids live in grasslands. They vary widely in body form. Examples include the yak, hartebeest, wild goat, bighorn sheep.
Pronghorns: 1 species
The pronghorn, Antilocapra americana, lives in North American grasslands. Both sexes have horns consisting of fused hairs sheathing a bony core; the sheath is shed each year.
Giraffes: 2 species
The two or three horns of the giraffe and okapi (absent in the female okapi) are bony growths covered by skin.
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