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.
The best way to attract hummingbirds is by putting out a feeder with nectar. Nectar is basically sugar water, and allows the hummingbirds to maintain the energy levels they need to catch insects. There are also many plants that you can add to your garden or yard to increase your chances of attracting hummingbirds.