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.
Broad-tailed Hummingbirds drink nectar from flowers, especially species such as larkspur, red columbine, indian paintbrush, sage, and scarlet gilia as well as sugar water from feeders. During spring migration, they also feed on flowers that are not typically used by other hummingbirds, including pussy willow, currant, and glacier lily.