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.
Here some fun hummingbird facts you can share with your friends and family: 1  Hummingbirds are the smallest birds. 2  Hummingbirds can eat up to twice their body weight in nectar every day. 3  Hummingbirds can perch on feeders, but their feet are not used for walking or hopping.