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.
Their primary food is nectar from flowers. In early spring, before the flowers are blooming, they often drink sap from tree wounds created by woodpeckers. Hummingbirds supplement the sugars from nectar and sap with insects for protein.atural sources of food should be supplemented by feeders. Hummingbird feeders are designed to provide a sugar-water solution. Hang them in a shady area that is open enough that the tiny birds won't fall prey to cats.