Do migrant birds collide with
windows more frequently than
expected by their population?

While looking for food and places to sleep, migrant birds might have more trouble

identifying windows and fly into them more often . However, it could also be that

there are simply more window collisions in the fall because there are more birds in

the area when migrant and resident birds co-occur in urban areas.

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.