The largest and heaviest of all living birds, the ostrich is instantly
recognisable, with its long, bare neck, large body and long, sturdy legs
(2) (4) (5).
Despite its relatively small head, it is also notable for having the
largest eyes of any land animal, measuring an impressive five
centimetres in diameter, and protected by long black lashes (2) (4). The adult male ostrich has black plumage, with a white tail and primary feathers,
and a bright pinkish or blue neck in the breeding season. The female is
smaller and is grey-brown in colour, while immature birds resemble the
female, but are slightly darker. Four subspecies are recognised, differing mainly in the colour of the neck and legs of the male, and in the amount of feathering on the head
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