The expensive brain and the evolution of brain size Vertebrate brains vary considerably in size, and this variation is often attributed to differing cognitive demands. Here, we ask whether the unusually high costs of brains have acted as constraints on the evolution of brain size. We confirm that [...]

The expensive brain and the evolution of brain size Vertebrate brains vary considerably in size, and this variation is often attributed to differing cognitive demands. Here, we ask whether the unusually high costs of brains have acted as constraints on the evolution of brain size. We confirm that [...]