Not all eggs are shaped like a chicken's— now we know why By Sarah Crespi, Jia You Jun. 22, 2017 Every egg rolls a different way. For centuries, scientists wondered why egg shapes are so different from one bird to the next. Now, we think we’ve finally cracked the mystery. To start, we need to know what egg shapes are even possible. Luckily, hobbyists and natural history museums have been collectin
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