Weasels' cousins are four different species of animals, namely polecats (8 letters), martens (7 letters), otters (6 letters) and ERMINES (7 letters). Polecats are small mammals that are related to weasels, ferrets and minks. Martens are also small mammals that are related to weasels and belong to the same family as polecats. Otters are semi-aquatic mammals that are related to weasels, badgers and wolverines. ERMINES are small mammals that are related to weasels and are also known as stoats or short-tailed weasels.