Meet the intriguing and shy brittle star. This boneless creature does not have eyes or a brain yet still somehow keeps an eye on everything. Then, in the murky waters of African rivers lives the elephantnose fish. It may not be able to see much in its muddy environment, but it can hear many things. Meanwhile, the little and colorful three-spined stickleback has an unexpected side: it gets hooked on decorating Then the flat, one-sided flounder will show you how it fights freezing from the inside out. Finally, the simple hagfish can be very quick to release a sticky and slimy trap that would mean big trouble for any predator.