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.
These eight tips for feeding hummingbirds are sure to help you attract hummingbirds by appealing to their hungry attitudes. 1  of 08. Provide Natural Food Sources. 2  of 08. Feeders filled with a classic nectar recipe can help birders attract more hummingbirds and save money over more expensive commercial nectar mixes. 3  of 08.