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.
Diversity of Nectar Plants â Ruby-throated hummingbirds feed on small insects and nectar. To attract hummingbirds, include a variety of flowering plants that provide nectar throughout the warmer months.Ruby-throated hummingbirds prefer the nectar from bright, tubular flowers, such as crossvine, Carolina jessamine, and red buckeye.iversity of Nectar Plants â Ruby-throated hummingbirds feed on small insects and nectar. To attract hummingbirds, include a variety of flowering plants that provide nectar throughout the warmer months.