Side view portrait of a bighorn sheep ewe showing its rectangular pupils in Wyoming in winter.

Bighorn Sheep Ewe Side Portrait

Wyoming, USA

A bighorn sheep ewe poses nicely for a side portrait. A bighorn sheep has acute eyesight, its primary defense against predators. Their eyes are space wide apart to allow for a wider field of view, estimated to be 320 degrees. In most animals this would decrease their depth perception. But a bighorn sheep's pupils are rectangular, allowing for better depth perception, despite their widely spaced eyes.

Photo © copyright by Dr. Edward Mikol.

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Related Galleries: Bighorn Sheep