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 use their beaks to drink nectar from flowering plants for energy and to survive. They also enjoy small insects and spiders that often reside on these types of flowers. Typically, these amazing small birds are attracted to red, orange and yellow flowers that produce high volumes of nectar.