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... a multidisciplinary team of biologists, computer scientists, mathematicians, and more in analyzing more than 49,000 eggs from about 1,400 bird species. ... The team translated the shapes of the eggs into mathematical models and incorporated data such as habitat, diet, and how many eggs each species laid at a time. They found that one of the best predictors of egg shape was flight ability. “Birds that are strong fliers—birds that tend to fly a lot or migrate long distances—tend to lay eggs that are more elliptical, or more pointy,” says Stoddard. The team published its findings in the journal Science in 2017.