Hermaphrodite flatworms, a master-of-disguise octopus and a fish that 'walks' on dry land are among the unusual underwater critters examined.
A look at weird animals, from those that fend off predators by squirting blood from their eyes, to those which eat their partners after mating
Get ready to brush feathers with the freakiest denizens of the winged world as we look at the planet's wackiest and most fearsome fliers.