Frogs croak at night primarily because it is the time when male frogs are actively trying to attract female frogs for mating. The cooler temperatures, higher humidity, and fewer predators at night create the perfect environment for these amphibians to move around, call loudly, and compete for mates. Male frogs produce loud calls to show dominance over other males and to appeal to the females, who choose mates based on the quality of these croaks. The croaking is essentially a love song and territorial display that helps frogs reproduce efficiently during their breeding season, which often coincides with the wetter, warmer times of the year. Nighttime conditions optimize their ability to call loudly and safely, increasing their chances of successful mating.