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Why don't we lay eggs?
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Some animals lay eggs, and their young hatch out of them. Other animals give birth to live young. But which strategy is best? That’s the question that’s been bothering CrowdScience listener Sameer in Canada. Is giving birth to live young a good reproductive strategy? It takes a lot of time and effort, and it doesn’t result in that many offspring. Egg-laying, on the other hand, allows you to produce lots of young at one time to maximise the chance of survival, seems easier than giving birth, and you can lay eggs more often. So why have humans and most other mammals evolved to give birth to live young? To find the answer, presenter Anand Jagatia travels way back into the past with Paul Barrat…