The bird brain is amazing, no?

Legagneux believes birds that learn to respond to cars based on the speed limits of certain roads have an advantage over those that don't. The birds that don't overreact to approaching cars can spend more time foraging for food (most of the birds studied were sparrows and carrion eaters like crows), while still protecting themselves from any approaching cars.

"This way, they are not spending a lot of time being vigilant by looking at the speed of each car," Legagneux said. The study is pub
lished in the latest issue of the journal Biology Letters.


http://www.nbcnews.com/science/birds-can-tell-speed-limit-certain-roads-8C10995682