What is a Japanese spider crab? They may look like something from a 1950s sci-fi film, but Japanese spider crabs are gentle giants. And giants they are. Of the 60,000 species of crustaceans on ...

highlights the difference in size between the male and his much larger mate (in some crab-spider species, the female is more than 60 times as big). The photo was a winner at this year’s London ...