ALL SABER-TOOTH and big cat fans should step over to Tetrapod Zoology, where Darren Naish reports on the Big Cats in Britain conference. The first part of this two-part survey discusses the possible late survival of Homotherium latidens, a saber-toothed cat, as well as extinct leopards and lions. The second talks about extinct pumas in Europe and cheetahs in America, geographical distributions that we are not accustomed to for these cats.