After more than 10 years on the air, you'd think they'd throw in new recurring characters. Or at least bring in animals new to the show. I believe they already had a killer whale, a sea lion, a dolphin, sea urchins, and whelks, but there are plenty of sea creatures yet to be used, like sea turtles, cuttlefish, sea otters, narwhals, swordfish (the living kind), hammerhead sharks (I think), horseshoe crabs, and leafy/weedy sea dragons (off Australia's coast).