Metabolic scaling is a field of research that focuses on understanding how metabolic rates change with body size across different species. It explores the relationship between metabolic rate and body size, and how this relationship can help us understand various biological processes such as growth, development, and aging. Metabolic scaling has important implications for ecological and evolutionary studies, as well as for understanding the physiological constraints on organisms of different sizes. Some of the key questions in this field include how metabolic rate scales with body mass, how it varies among different species, and how it is influenced by environmental factors.