Grammar

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know be say contain suggest depend fly go evolve be
create map look put look be find lay be find
Scientists believe they why birds' eggs are different shapes. Some eggs are quite round; some kind of potato-shaped; and others are longer and pointy. Two thousand years ago, the Greek philosopher Aristotle flatter eggs had female chicks inside them and rounder eggs male chicks. But he was wrong. A new study from Princeton University in the USA that the shape of the egg on how well and how fast the female bird . Professor Mary Stoddard said: "It has not unnoticed that birds have to [lay eggs with] shapes that quite diverse in form - everything from a spherical owl egg to a pointy sandpiper egg."

Professor Stoddard and her colleagues a mathematical formula to the shape of different eggs. They at almost 50,000 eggs from 1,400 different bird species. The researchers the shape, length and height of the eggs into a computer database. They also at how oval the eggs . The researchers that the birds that the most-oval-shaped eggs were the best fliers. Professor Stoddard said: "We were shocked to see that one of the best explanations for egg shape variation flight ability." The researchers that hummingbirds and sandpipers laid the most-oval-shaped eggs; owls laid the roundest eggs; and sea birds laid the pointiest eggs.

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