what animal has the largest brain to body weight ratio
This means that the sperm whale actually has quite a small brain in comparison with its body. Largest brain in proportion with body This question is a little harder to answer because of the different measurements. The shrew, a mouse-like creature, has a brain that is 10% of its body size. This makes it the animal with the largest brain to body ratio. However, humans are the leaders when it comes to Encephalization Quotient (EQ), which is a way to measure brain size based on actual and predicted brain size.