Some of the birds were very close, about 10 feet away, others about 30. With the 5Dmk2 full frame I can crop substantially and keep the quality high. I've got about 4000 other pictures last week of the full bodied birds and alligators, but I seem to enjoy getting close to their heads, especially if it's still sharp. Most of the sites I went to have birds and gators that aren't spooked as much by humans, so it wasn't too hard getting close. I also use Aperture fyi... Al.