Hummingbirds zip, dart, and sprint from feeders to flowers, appearing little and fragile. How much do hummingbirds weigh? Small hummingbirds weigh 0.1 to 0.2 ounces (less than a marshmallow).
Costas, like this guy, weigh a tenth of an ounce. The crouching stance makes them look smaller.
Cuban bee hummingbirds are the smallest birds on Earth, measuring 2 inches from bill to tail. In contrast, the blue-throated hummingbird is almost sparrow-sized. It is the largest U.S. breeding hummingbird.
Most hummingbirds are 3–4 inches. Allen's hummingbirds are the second-smallest US species after Calliopes. Allen's are 3" long. Small, Anna's hummingbirds measure 3.9 inches from mouth to tail.
The broad-tailed hummingbird's tail extends beyond the wingtips while perched and resting, making it wider and longer than most other U.S. and Canadian hummingbirds.
If you encounter a bug-sized hummingbird-like insect visiting nectar blossoms at dusk, it may be a moth!
I found that male hummingbirds push their bills deeper into the sugar water than females at my feeders. Are women's bills longer? asks Hazelwood, Missouri Birds & Blooms reader Pat Comack.
Kenn and Kim Kaufman: Interesting insight! Average ruby-throated hummingbird females have a longer bill. Most people wouldn't notice the difference—less than one-tenth of an inch. Females have slightly higher bills overall.