The evolution of short tails was crucial to the improvement of bird flight, Min Wang, a paleontologist from the Chinese Academy of Sciences who co-led the study, tells Xinhua. It helps shift the ...

and northwestern crow. Study of vocalizations, bill structure and size, tail shape, and overall structure of this species will greatly aid in the identification of other crows and ravens.

American crows are significantly smaller than ravens. They weigh less than a pound, measure 17 to 21 inches from beak to tail, and have a wingspan of 34 to 39 inches, roughly the length of a ...