Horseshoe crabs are something of a rarity these days, with only four known species found around the world.... But according to researchers at the University of New England in Australia, this was certainly not the case hundreds of millions of years ago.... So what better way to celebrate the discovery of one such prehistoric creature than by naming it after Sir David Attenborough-a man who has been inspiring a love for nature for more than 60 years. The newly named Attenborolimulus superspinosu