Gruber: I wrote a paper with Neil Schneiderman in 1975 demonstrating that lemon sharks learn faster and retain a conditioned response longer than a cat or rabbit. Sharks and their large-brained ...

The lemon shark scours the sandy sea bed for food, but how does it get a good grip on hidden prey? Steve heads to the Bahamas in the Caribbean to dive with these feisty sharks.

“Rather than resembling an oversized great white shark, it was actually more like an enormous lemon shark, with a more slender, elongated body. That shape makes a lot more sense for moving efficiently ...