Berglund's Law is a principle in the field of ecology that suggests that species with larger body sizes tend to have longer lifespans. This observation highlights a general trend where larger animals, such as elephants and whales, often live significantly longer than smaller species, like mice or birds. The law emphasizes the relationship between size and longevity, indicating that larger organisms may have slower metabolisms and lower predation risks. This concept helps ecologists understand population dynamics and the evolutionary strategies of different species in their habitats.