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.
Annaâs Hummingbirds eat nectar from many flowering plants, including currant, gooseberry, manzanita, and many introduced species such as eucalyptus. They also eat a wide array of insects from understory leaves, crevices, streambanks, or caught in spider webs, plucked from the air, or taken from flowers.