Text 2:
What is the main topic of this paragraph?
Stand up when you know.
We all know what an egg looks like, right? Well, we might know less than we think—bird eggs can be spheres, teardrops and anything in between. An interdisciplinary group of scientists may have made progress in cracking the mystery behind how these different shapes emerged.
A new study in Science shows that differences in flight ability might actually start as early as the egg: birds that take to the skies have more elliptical, asymmetrical eggs, while land-bound birds (like ostriches) have more spherical eggs.