Because, IIRC, a lot of neurons are dedicated to motion/sensing.
Bigger animals may require more neurons to handle moving larger and/or more complicated muscle groups.
Interesting related point there is the encephalization quotient which is related to the predicted ratio of brain size to body mass. On the wikipedia page [0] they list the EQ for various animals. Humans are the highest but dolphins and ravens are not far behind.
Bigger animals may require more neurons to handle moving larger and/or more complicated muscle groups.
Interesting related point there is the encephalization quotient which is related to the predicted ratio of brain size to body mass. On the wikipedia page [0] they list the EQ for various animals. Humans are the highest but dolphins and ravens are not far behind.