Destiny Tales—Loading Ready Run
We’ve been wowed by your response for the Cities Project assignment! Instagram user @katedoo shared this discovery from Fellsmere Park in Malden, Mass. Keep submitting photos of nature reclaiming spaces in your community with the tag #nprcities on Twitter, Tumblr, and Instagram and we may feature it on our Instagram or on NPR.org.
kittlegit said: Why are eggs shaped weird?
There are two questions here…first, what’s the evolutionary advantage to having egg-shaped eggs.We’re not precisely sure but there are two prevailing theories. First, the “egg” shape is a sphere tapered to a point on one end creating a kind of wedge. The muscles inside the bird squeeze down on that wedge to push the egg out blunt-end first. A sphere would be much more difficult to squeeze out. (Not that either way sounds particularly fun to me.)Second, a spherical egg would be able to roll forever in any given direction while an egg-shaped egg, when shoved, rolls in a circle around a central point, which would increase the likelihood that eggs would stay in a nest. This theory is reinforced by the fact that cliff-dwelling birds have an even more pronounced egg shape.The other question in your question is how do birds make their eggs egg-shaped. Obviously, if it were left up to simplicity, the egg would be a perfect sphere. Unfortunately, I do not know the mechanics of how this shape is actually achieved inside of a bird…and I really would like to know.-Hank