The Cookiecutter Shark is famous for its gruesomely efficient parasitic attacks on whales, seals and big fish. But that is only a part of the story when it comes to this extraordinary, and extraordinarily bright, shark ...  Show notes, with photos, video and links to lots more information, are...

The Giant Barrel Sponge: one of the simpler animals on Earth yet grows to enormous size over a crazily long life, exerts a big influence on reef ecosystems and, unlike a great many animals in our oceans, seems to be thriving ... Show notes, with photos, video and links to lots more information,...