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.
local ruby-throated hummingbird populations as well as populations of other species that rely on simi-lar habitat. Food Ruby-throated hummingbirds feed by day on nectar from wildflower blossoms and the flowers of many species of shrubs and vines. Insects comprise a large percentage of the ruby-throatâs diet, and