Gap Fill - Eggs - Level 2


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   ability      best      different      different      different      formula      height      how      new      oval      pointy      pointy      round      rounder      sea      shapes      shocked      species      team      why  
Scientists think they know birds' eggs are different . Some are , some are potato-shaped, and others are . Two thousand years ago, Aristotle said flatter eggs had female chicks inside and eggs contained male chicks. But he was wrong. A study says that the shape of the egg depends on well the female bird flies. A professor said she noticed that birds have evolved to lay eggs that have shapes. They are all in form, "everything from a spherical owl egg to a sandpiper egg".

The professor and her made a for the shape of eggs. They looked at 50,000 eggs from 1,400 different bird . They put the shape, length and of the eggs into a computer. They also looked at how the eggs were. The researchers found that the birds with the most-oval-shaped eggs were the fliers. The professor said: "We were to see that one of the best explanations for egg shape [difference] was flight ." Hummingbirds laid the most-oval-shaped eggs; owls laid the roundest eggs; and birds laid the pointiest eggs.

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