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.

Editor’s note: This is part of a short series on hummingbirds. We asked expert bird bander, Kay Lookingbill, if we could compile some of her wonderful fun hummingbird facts from her Facebook posts and ...