Einstein was no elephant
If brain size alone were the hallmark of intelligence, elephants would be the Einsteins of the world. The notable Russian neuroscientest, Luria, hypothesized that it is not so much the size but the way the brain of the human is organized that gives us (humans) the language edge.
Luria suggested that at birth, all the modalities of the baby's brain are functioning, as they are for most baby mammals. But these modalities are functioning as individual unconnected units. We have stressed the need for all these modalities to be stimulated, in order to maximize the development of the neural infra-structure for auditory, visual and haptic processing.