11.   But if it was there, Fristrup said, it would be hard to figure out what the bird was doing for two months.

12.   Clearly, island birds face a much higher probability of extinction than mainland birds do.

13.   It has a band on the same leg that his bird did, although he has yet to read all the numbers.

14.   Jones puts himself at risk the same way his birds do, willingly, and fully aware of the consequences and with the attitude necessary to avoid those consequences.

15.   So cuckoos might well be expected to have evolved all manner of tricks to get other birds to do such work for them.

16.   Some birds will do a feint and sidestep an aggressive rooster flying in at them.

17.   The Brooklyn birds had done it.

18.   The bird can only do so much.

19.   The monarch is the only insect that migrates as birds do.

20.   These birds did quality work, tapping lightly and intermittently, like a cobbler working on an expensive shoe.