Invested in the Nature of Energy
Every aspect of nature is wholly dependent on creating, consuming or conserving energy. Earth is fed by the energy of the sun which in turn produces all the chemicals humans need in order to survive.
Hummingbirds have the highest energy expenditure of any warm-blooded animal, with a heart rate of up to 500 beat-per-minute, this bird is nearly always on the edge of starvation. A hummingbirs needs to slurp up more than its body weight in nectar each day.