Causes and symptoms. Fatigue may be the result of one or more environmental causes such as inadequate rest, improper diet, work and home stressors, or poor physical conditioning, or one symptom of a chronic medical condition or disease process in the body.
1 A hummingbird will use its tongue to lap up nectar from flowers and feeders. 2  A hummingbird's tongue is grooved like the shape of a W. 3  Hummingbirds have tiny hairs on the tip of the tongue to help lap up nectar.
Roughly a third of a hummingbirds diet is bugs. Hummingbird food is mosquitoes (the blood sucking kind), spiders, gnats, fruit flies, and sometimes even small bees. During a rain storm, hummingbirds eat small insects rather than nectar. If you ever wondered, they do eat much more before migration starts. Hummingbirds need to gain 30% - 40% of their body weight before migration. They store their undigested food in a small pouch at the base of the throat called a crop.