They enter a state of suspended animation called estivation, during which their metabolism and body temperature drop. They remain inert until cooler, moister conditions return. Since there are no streams and few water holes at Craters of the Moon, animals must get the moisture they need directly from their food. Mule deer munch bitterbrush leaves. Violet-green swallows snatch insects from the air.
Rattlesnakes inject their venom and swallow squirrels whole.
Each of these foods contains water essential to life. The following list should assist you in identifying the animals you see during your visit. All animals have been classified as common or uncommon. Quite common at some time during the year. May include resident, migrant, or breeding animals.