Amphibians may come out during the day, but only if there is a sufficient amount of moisture. However, they might risk water loss or even death to accomplish some goal such as feeding or mating. Amphibians can reduce water loss by reducing the amount of surface area exposed to evaporation. Some salamanders coil their bodies tightly to prevent evaporative water loss. Tree frogs reduce surface area by selecting a shaded site and tucking limbs close to the body.
Some amphibians dig deep burrows and stay there for up to nine months at a time.
Terrestrial amphibians are generally nocturnal, with the exception of some species of anurans. The skin of amphibians is highly permeable. Most salamanders and all frogs that live in aquatic areas have smooth skin on the belly and sides. Most terrestrial anurans have rough skin on the belly and the thighs. The rough stomach surfaces provide a great surface for water absorption.