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The long neck and legs keep their head up to 2.8m above the ground, and their eyes are said to be the largest of any land vertebrate: 50mm in diameter; they can therefore perceive predators at a great distance. The eyes are shaded from sunlight from above. However, the head and bill are relatively small for the birds' huge size, with the bill measuring 12 to 14cm. Their lifespan is up to 40-45 years.
Cross-eyed viewing Parallel Viewing
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