Love's in the Air

Six fascinating ways birds showcase their special bonds

- By Lisa Ballard

400 To fly back to their existing burrows each spring, Atlantic puffins flap their wings up to 400 times per minute. Once home, bonded pairs rub bills as a sign of affection.

1 California condors wait until they're 6 to 8 years old to find mates, then produce only one egg every one to two years.