Egg shapes are incredibly diverse among bird species: hummingbirds lay eggs in the shape of Tic Tacs; owls make globe-like eggs; and sand pipers lay pointy eggs shaped like raindrops.

Viral Video: Intelligent Crow Solves Shape Puzzle to Get Treats. ... In the end of the video, the woman put out her hand in front of bird that has peanuts on it for doing a good job.

Their conclusion: Egg shape is related to how much time a bird spends in flight, according to a report in Friday’s edition of the journal Science. Advertisement.

Roughly 360 million years after that revolutionary hard shell, eggs still hold a whiff of mystery. The diversity of bird eggs, in particular, has perplexed mathematicians, biologists and engineers ...

An analysis of nearly 50,000 bird eggs finds a link between a species’ egg shape and flight ability.