Hummingbirds: Jewelled Messengers


March 30, 2016

Expired 3.0 36 x
This is the story of how hummingbirds became the ultimate creatures of the air. Hummingbirds live at the limits of what is possible. They have the highest metabolism of any vertebrate, with a heart rate of 1,200 beats per minute. Their wings beat 50 times a second. They can hover on the spot, even fly backwards. To our eye...