A recent study demonstrates that some fish have long memories, and can remember the exact location of food for 12 days. The reason is pretty straightforward: fish that can remember where they found good food have an advantage over fish who cannot. The game of evolution favors the "smart" fish!

This comes on the heels of a review paper that concluded that fish have advanced cognition and can feel pain (shocker!). The poor sea creatures are often assumed to be incapable of any sort of reasoning, and --amazingly-- some people actually thought they didn't feel pain. Recent research, and a review of much past research, has laid these notions to rest.

Moral of the story: fish, like mammals and birds, have thoughts and feelings. And no one should be surprised.