Group I. Pecora (Lat., plural of pecus, cattle) or Ruminantia (Lat., rumen, a paunch).—Ruminating or cud-chewing animals. Examples: ox, sheep, goat, antelope, deer and giraffe.
Group II. Tragulina (Gr., tragos, goat), or Deerlets. Example: kanchil.
Group III. Tylopada (Gr., tylos, a knob or swelling, and pous, podos, a foot).—Ruminants with digits encased in cutaneous pads. Example: camel.
Group IV. Suina (Lat., sus, a pig).—Swine-like animals. Examples: swine, peccary and hippopotamus.
Order VII. Sirenia (Lat., siren, a sea nymph).—Sea-cows. Examples: manatee and dugong.
Order VIII. Cetacea (Gr., ketos, a whale), animals of the whale kind. Examples: whale and dolphin.
Order IX. Edentata (Lat., edentatus, toothless).—Toothless animals. Examples: sloth, anteater and armadillo.
Order X. Marsupialia (Lat., marsupium, a pouch).—Pouched animals. Examples: kangaroo and opossum.
Order XI. Monotremata (Gr., monos, single; trema, orifice).—Egg-laying mammals. Examples: duckbill or water mole.
Class II. Aves (Lat., avis, a bird).—Birds, animals produced from eggs by the application of heat, usually supplied by the body of the mother bird in close contact with them. They are always clothed with feathers, which are a part of their special construction for flight. Examples: eagle, swan, ostrich and lark.