Cardinals also mate for life. The Brown-Headed Cowbird has been known to throw out the eggs of other nesting birds and replace them with its own. The nesting bird, unaware of the switch, goes on to raise the cowbird's chicks. The male mockingbird may sing up to 30 different bird songs in a 10-minute period. The catbird has a call very similar to a kitten's cry.
Woodpeckers have four toes - two facing forward and two facing back.
This helps them to climb on trees. Starlings can fly up to 55 mph, twice as fast as most common backyard birds. Chimney Swifts drink on the fly by scooping water from the surface of ponds and pools.