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Not All Eggs Are Egg-Shaped - References

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What is ”egg-shaped” exactly? You know, according to science. I used to think it was the shape of a chicken egg. Then one day I saw a collection of eggs from lots of different bird species, and I realized just how many different kind of egg shapes there really are! I had to know why. And it turns out a couple teams of scientists had wondered the same thing. Here’s what science says about why eggs are egg-shaped, if that's even a thing, which I’ve learned it might not be. The evolution of bird eggs is super cool!

Sources:

Comprehensive study of egg shape across thousands of bird species

• Stoddard, Mary Caswell, et al. "Avian egg shape: Form, function, and evolution." Science 356.6344 (2017): 1249-1254. https://science.sciencemag.org/content/356/6344/1249.abstract
• Birkhead, Tim R., et al. "The evolution of egg shape in birds: selection during the incubation period." Ibis 161.3 (2019): 605-618.
• Stoddard, Mary Caswell, et al. "Evolution of avian egg shape: underlying mechanisms and the importance of taxonomic scale." Ibis (2019).
• https://vis.sciencemag.org/eggs/
• https://www.seas.harvard.edu/news/2017/06/how-eggs-got-their-shapes

Biophysics of bird egg shape

• Juang, Jia-Yang, et al. "The avian egg exhibits general allometric invariances in mechanical design." Scientific reports7.1 (2017): 14205. https://www.nature.com/articles/s41598-017-14552-0
• Deeming, D. Charles. "Effect of composition on shape of bird eggs." Journal of Avian Biology 49.1 (2018): jav-01528 http://eprints.lincoln.ac.uk/29220/7/29220%20JAB%20revised%202%20submitted.pdf
• http://physicsbuzz.physicscentral.com/2012/09/sharper-curve-stronger-egg.html
• https://phys.org/news/2017-01-strong-egg.html