ANN ARBOR - North American migratory birds have been getting smaller over the past four decades and the reason appears to be related to climate change, according to findings from a University of ...

Being called a “bird brain” may be closer to a compliment than an insult. That’s because new research suggests that some birds evolved over time to have smaller bodies and maintain large brains.

Birds have been shrinking as global temperatures rise and the climate warms, a new study published Wednesday in the journal Ecology Letters has found. Research led by scientists at the University of ...

Biologists provide evidence that maximum body size in birds is constrained by the amount of time it takes to replace the flight feathers during molt. Why aren't birds larger? Fifteen-kilogram swans ...

For most birds, eyes are essential to life on the fly. They inform split-second aerobatic maneuvers amid dense branches and pinpoint distant predators or prey. Yet when studying how birds might adapt ...