Every pet owner thinks their own dog, cat, fish or hamster is a genius. CAN FISH COUNT? unveils just how widespread that intelligence is in nature.

Brian Butterworth is Emeritus Professor of Cognitive Neuropsychology at University College London.
He taught at Cambridge University for eight years and has held visiting appointments at MIT and the Max Planck Institute at Nijmegen. He is currently working on the neuroscience and the genetics of mathematical abilities and disabilities. He was elected Fellow of the British Academy in 2002, and is the author of The Mathematical Brain, as well as of several academic books. He lives in London.