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.
Besides nectar from flowers hummingbirds enjoy eating insects and drinking nectar syrup from Humming bird feeders. With over 18 different species of Hummingbirds in America itself, there is always the chance that you ll see 2 or more types flitting in the flowers.