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.
Some eat seeds, berries, fruit, insects, other birds, eggs, small mammals, fish, buds, larvae, aquatic invertebrates, acorns and other nuts, aquatic vegetation, grain, dead animals, garbage, and much more... During the spring and summer months, most songbirds eat mainly insects and spiders.