The Martens constitute the genus Martes within the subfamily Mustelinae, in family Musteliae. They are slender, agile, animals, adapted to living in taigas, and are found in coniferous and northern deciduous forests across the northern hemisphere. They have bushy tails, and large paws with partially retractile claws. The fur varies from yellowish to dark brown, depending on the species, and, in many cases, is valued by fur trappers. Martens are carnivorous animals related to wolverines, minks and weasels. Their diet consists of squirrels, mice, rabbits, birds, fish, insects, and eggs, and they will also eat fruit and nuts when these are readily available.