Calliope Hummingbird Identification and Size Measuring a mere 3 inches long and weighing one-tenth of an ounce, roughly the same as a table tennis ball, the Calliope hummingbird is incredibly tiny.

A brilliant metallic-orange gorget can appear bright orangish scarlet to deep coppery-green. Look for a clean white breast band or patch below the gorget. The rufous hummingbird, another species ...