Doyne's Law is a principle in the field of evolutionary biology that suggests that larger species tend to have longer lifespans than smaller species. This law highlights the relationship between body size and longevity, indicating that as an organism's size increases, its life expectancy also tends to increase. The law is named after Dr. Doyne, who studied various species and observed this pattern. It provides insight into how different factors, such as metabolism and reproductive strategies, can influence the lifespan of organisms across the animal kingdom.