Mustelidae or Mustelids (from Latin mustela, weasel), commonly referred to as the weasel family, are a family of carnivorous mammals. The Mustelidae are a diverse family and the largest in the order Carnivora, at least partly because this family has in the past been a catch-all category for many early or poorly differentiated taxa.
The Mustelidae in general are phylogenetically relatively primitive and so were difficult to classify until genetic evidence started to become available. The increasing availability of such evidence may well result in some members of the family being moved to their own separate families, as has already happened with the skunks, previously considered to be members of the mustelid family.
Mustelids vary greatly in size and behavior. The least weasel is not much larger than a mouse. At the other end of the scale, giant otter can measure up to 2.4 metres (7.9 ft) in total length and sea otters can exceed 45 kilograms (99 lb). The wolverine can crush bones as thick as the femur of a moose to get at the marrow, and has been seen attempting to drive bears away from their kill. The sea otter uses rocks to break open shellfish to eat. The marten is largely arboreal, while the badger digs extensive networks of tunnels, called setts. Some mustelids have been domesticated. The ferret and the tayra are kept as pets (although the tayra requires a Dangerous Wild Animals licence in the UK), or as working animals for hunting or vermin control. Others have been important in the fur trade. The mink is often raised for its fur.
As well as one of the most species-rich families in the order Carnivora, mustelidae is one of the oldest. Mustelid-like forms first appeared about 40 million years ago, roughly coinciding with the appearance of rodents. The direct ancestors of the modern mustelids first appeared about 15 million years ago.
Within a large range of variation, the mustelids exhibit some common characteristics. They are typically small animals with short legs, short round ears, and thick fur. Most mustelids are solitary, nocturnal animals, and are active year-round.
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