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Shell-ducks

Closely allied to the last, and by some included with them, are the Shell-Ducks (Casarca), of which four species are known, these being widely distributed over the southern parts of the Old World. They are separated mainly on the ground of the dissimilarity of the sexes.

  • Birds are a miracle because they prove to us there is a finer, simpler state of being which we may strive to attain. Douglas Coupland
  • Birds are a group of endothermic vertebrates, characterised by feathers, a beak with no teeth, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a lightweight but strong skeleton.

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