Hummingbird Genes Trace Existence 'on the Extremes'
Thursday, April 3, 2014 - 20:30
in Biology & Nature
WASHINGTON — For such small creatures, hummingbirds have racked up an huge list of claims to fame.They are the smallest birds and the smallest warm-blooded animals on Earth. They have the fastest heart and the fastest metabolism of any vertebrate. They are the only birds that can fly backward.