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.
It is also fun to watch them learning how to do it. In nature, hummingbirds eat flower nectar for energy and bugs for protein. Flower nectar is 21% to 23% sucrose - regular table sugar - so it is very easy and inexpensive to make. It is a lot harder to make bugs, so I recommend you stick to feeding nectar. Mix 4 parts water to 1 part table sugar in a pan.