In the morning, they contract their thoracic flight muscles to generate metabolic heat. When the moth is warm enough it can fly. One idea was that moths vary metabolic heat generation. Heinrich proposed that their metabolic rate is fairly constant, and that the moths thermoregulate by varying the rate of heat loss to the environment. A handful can also generate useful metabolic heat.
Skunk cabbage grows in wet places in usually deciduous woods.
It does most of its growing in spring before the trees leaf out. To get an early start, it generates enough heat to melt the snow around it in Feb. and March. It maintains a temp. It has a starchy taproot from which it gets the energy, and it varies its heat production with the temperature. Not only does the plant benefit from the warmth, pollinators are attracted to the warm flowers.