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.
Hummingbirds get nectar from flower blossoms and sometimes eat the insects that they find in the blossoms and have been known to pick insects out of spider webs. About a third of their diet consists of small insects and spiders â which they sometimes catch in mid-air.