Page 97 - The World of Animals

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their eggs in it. But when they lay more than 10 to 12 eggs, they
need to adjust the size of the hole accordingly. If the ostrich dug this

hole in soil instead of sand, this would take a longer time, causing
the birds to consume more energy. Indeed, digging sand is much

easier than soil. You may even dig sand with your hands whereas
you need a shovel to dig soil. For this reason, ostriches, by the

inspiration of Allah, prefer digging in the sand rather than in soil
and thus consume minimal energy. Then they cover their eggs with

sand again without difficulty.