National Geographic : 1947 Aug
Hummingbirds in Action "Hanging" in Mid-air, a Wary Hummingbird Looks for Possible Danger Like all his fellows, he pauses frequently to straighten up and reconnoiter. Since he was almost always in perpetual motion, catching this pose with the camera, says Mr. Edgerton, was partly a matter of luck. © National Geographic Society Kodachromes by lHarold E. Edgerton Except for Whirring Wings, on the Backstroke, the Bird Here Is Virtually Motionless Although there are more than 600 kinds of hummingbirds in the world, only 16 exist in North America, north of Mexico (but including Baja California). Only one, the ruby-throat, ranges east of the Mississippi.