Pine martens (Martes martes) are elusive, cat-sized members of the mustelid family, which includes otters, weasels and badgers. With prominent ears, chocolate-brown fur, sharp claws and a distinctive cream-yellow chest bib, they are stealthy, acrobatic hunters well accustomed to wooded areas and overgrown gardens. They’re classed as critically endangered, but with recent releases back into the wild, we’re starting to see more about.