Aestivation Aestivation Aestivation or æstivation (from , summer, but also spelled estivation in American English) is a state of animal dormancy, similar to hibernation, characterized by inactivity and a lowered metabolic rate, that is entered in response to high temperatures and arid conditions. It takes place during times of heat and dryness, the hot dry season, which are often the summer months. Invertebrate and vertebrate animals are known to enter this state to avoid damage from high temperatures and the risk of desiccation. Both terrestrial and aquatic animals undergo aestivation. The fossil record suggests that aestivation may have evolved several hundred
Politics of the Arizona Borderlands is on foot through the Sonoran Desert. The trek takes upwards of three days and immigrants face a host of issues while making it. Near the border, temperatures rise into the triple digits during the daytime in the summer months and fall to near freezing during the nighttime in the winter months. Average annual precipitation varies along the border but can be as low as three inches, while rainfall during the North American Monsoon season can be surprising and deadly (resulting in the passing of the Stupid Motorist Law, for example). Immigrants attempting to cross the border frequently die making