True blue is one of nature's rarest tricks, and the animals that pull it off range from tiny ocean drifters that steal venom ...

He cooks three of the world’s deadliest and strangest crabs, starting with a mud crab aggressive enough to take off a finger with one pinch. Then comes a tiger crab with razor-sharp claws and stripes ...

Some frogs have evolved features so strange that scientists struggle to explain them, and a few look less like amphibians ...