Similar reason but the other way around – we believe ostriches have evolved long necks to reach to food on the ground and also so it can bury its head in the sand – a strange nautral behaviour!
They need them to reach the food on the ground because they are so tall!
I disagree with Kevin I think that burying their head in the sand is a myth, it just looks like they do because they lay on the ground and they lower their head and neck when the sense danger, from a distance it looks like there is only a body left
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