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 may be some of the smallest birds in the world, but fluttering those tiny wings can be quite a workout. Flapping away at up to 90 beats per second burns up calories fast; to maintain their momentum, hummingbirds need to eatâa lot! To satisfy their speedy metabolisms, these busy birds consume half their body weight in bugs and nectar, feeding every 10-15 minutes and visiting 1,000-2,000 flowers per day. You can help these hardworking foragers get the nutrients they need by providing them with their favorite post-workout mealânectar.