Sweet-tooth bats go for quantity in wild
In lab experiments, bats prefer syrupy nectars high in sugar, but in the wild, they pollinate plants producing mostly watery nectars.
Why? The answer may lie in something called the Weber-Fechner law, which says that animals, including people, commonly perceive physical stimuli in relative increments rather than absolutes. They can be more sensitive to changes in quantity than in quality. Nectar-feeding bats must consider the volume of available nectar and its sugar concentration. They prefer high levels of both, but the Weber-Fechner law predicts that the bats ought to perceive increases in volume more acutely than they do increases in sugar concentration.
New research confirms it: Bats prefer to pollinate plants that produce more nectar, even if that nectar is less sugary.