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.
Quick Answer. According to the Royal Society for the Protection of Birds, small birds such as sparrows and starlings eat berries, seeds, grains, grubs and plants. Hummingbirds consume fruit juice, nectar, tree sap, aphids, gnats, wasps, flies, beetles and spiders. Continue Reading.