The world’s largest hummingbird has been hiding in plain sight for centuries — and scientists only discovered the species is distinct from another giant species after attaching tiny backpacks to ...

Hummingbird migrations take place in spring and fall and those events are cause for excitement among many people. "They are the gateway drug to bird watching because they are incredibly charismatic," ...

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.

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. The world’s ...