When people think of intelligent animals, they immediately think of dolphins, elephants, and chimpanzees. But one of the most intelligent problem-solvers is hiding deep beneath the surface, called the ...

We named him Squirt—not because he was the smallest of the 16 cuttlefish in the pool, but because anyone with the audacity to scoop him into a separate tank to study him was likely to get soaked.

If humans vanished overnight, which species would dominate Earth? An Oxford biologist suggests octopuses possess intelligence, adaptability and evolutionary traits that could reshape life’s future.