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.
In fact, no animal has a faster metabolismâroughly 100 times that of an elephant. Hummingbirds burn food so fast they often eat 1-1/2 to 3 times their weight in nectar and insects per day.Perhaps Ruby-throated hungrybirds is a more descriptive name for them! Maybe this explains why people rarely see hummers when they aren't eating.ummingbirds burn food so fast they often eat 1-1/2 to 3 times their weight in nectar and insects per day. Perhaps Ruby-throated hungrybirds is a more descriptive name for them! Maybe this explains why people rarely see hummers when they aren't eating.