Flight demands may have steered the evolution of bird egg shape
Elongated, asymmetrical forms are common among strongest fliers
![eggs](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/06/062217_LH_eggs_main.jpg?fit=860%2C460&ssl=1)
EGG DIVERSITY Bird eggs vary greatly in shape, size and color. In a new analysis, researchers look for links between egg shape and birds’ traits and lifestyles.
Harvard Museum of Comparative Zoology