What are rhino horns made out of?

What’s the biggest bird in the world?


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Answer: Hair.

Answer: The ostrich.

We all know how large an ostrich egg is. But, because the ostrich can be over 6' tall, the egg is 2% of it's body mass.

By contrast, it's cousin the kiwi, another flightless bird, is about the size of a chicken, but lays an egg which is around 25% of it's mass.

The reason is because a bird who would eat it's young, find the young too large after it spends around 80 days in the super large egg, growing slowly but constantly.