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 donât eat seeds at all and hummingbirds eat only flower nectar is false. Hummingbirds mostly eat flower nectar but not only flower nectar. Most of their diet is nectar from flowers. Hummingbirds may visit 1,000 flower per day in their search for nectar.