The term for the time when animals are least active, typically during the hottest part of the day, is referred to as "crepuscular." However, in the context of high daytime temperatures, the more specific term is "diurnal." Many animals adjust their behavior based on temperature and availability of food, often seeking shade or burrowing during peak heat to conserve energy and avoid predation or heat stress. This behavioral adaptation is common among various species, including mammals like deer and rodents, and is critical for their survival in changing environmental conditions. Activity levels often resume during cooler hours of the day, such as early morning or late afternoon.