Small but speedy. Tiny but aggressive. Little bodies, big appetites. Hummingbirds are a study in extremes. They are the lightest North American birds. Most weigh less than two pennies at 3 to 4 grams.

Ruby-throated hummingbirds fly non-stop across the Gulf of Mexico to reach the best breeding grounds first. The 600-mile journey takes 15-20 hours, and the birds double their body weight to prepare ...

The story of hummingbirds began millions of years ago, when a tectonic shift reshaped South America, and the Andes Mountains ...