Overview

• Researchers analyzed brain and body sizes from 1,500 species, revealing a curved relationship between brain size and body size.
• Humans have evolved significantly larger brains relative to body size, deviating from the trend observed in most mammals.
• The study identified rapid evolutionary changes in brain size among primates, rodents, and carnivores.
• Bats showed unique brain size changes due to the evolutionary demands of flight.
• The findings suggest that very large brains might be too costly to maintain, creating a 'curious ceiling' in brain size evolution.