Since dinosaurs came from birds!: some fish, large turtles, winter-flying moths (at least while they are flying), aroid flo(cid:449)ers . In theory, we can extrapolate the curve from below the lower critical temperature to tb: we can take the slope of the curve and extrapolate the curve to get the body temperature. Less of a surface area when they are rolled than when stretched out to preserve heat: opposite when they are warm open their bodies flat to lose more heat. Need to generate heat when the animal starts getting outside of the thermoneutral zone: metabolic heat from muscles and biochemistry. Plants can generate heat too: ex: skunk cabbage, they pollinate early in the season and they heat the organ up (using mitochondria), which produces a smell to attracts pollinators, usually this is a bad smell! Because they are pollinated by flies looking for dead bodies.