There’s no mistaking the dizzying display of a hummingbird’s wings as it zips around from flower to flower looking for nectar. But often, that same frantic action is used to chase other hummingbirds.

Hummingbirds are tiny and delicate, but don’t be fooled: They are among the most aggressive birds in the avian kingdom. Their territorial fury is especially aimed at other hummingbirds. Competition ...

The researchers came across this discovery through the use of picocam, a 3D-modeling technology that Mansfield developed, ...

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.