Building bigger brains | Sharon Darwish

A new study uncovers the role of a single gene that can control brain size and intelligence - of zebrafish and guppies

Bottlenose dolphins have an average brain mass of 1.6 kg, slightly greater than that of humans, and about four times the size of chimpanzee brains.

Although you couldn't really imagine a dolphin writing poetry, dolphins demonstrate high levels of intelligence and social behaviour. For example, they display mirror self-recognition, as well as an understanding of symbol-based communication systems.