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Mustelidae comprises about 56—60 species across eight subfamilies.

Mustelids vary greatly in size and behaviour. The least weasel can be under a foot in length, while the giant otter of Amazonian South America can measure up to 1. The wolverine can crush bones as Enironment as the femur of a moose to get at the marrowand has been seen attempting to drive bears away from their kills.

The sea otter uses rocks to break open shellfish to eat. Martens are largely arborealwhile the European badger digs extensive tunnel networks, called setts.

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Some mustelids have been domesticated: the ferret and the tayra are kept as pets https://amazonia.fiocruz.br/scdp/blog/woman-in-black-character-quotes/pope-urban-ii.php the tayra requires a Dangerous Wild Animals licence in the UKor 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 being one of the most species-rich families in the order Carnivora, the family Mustelidae is one of the oldest. Within a large range of variation, the mustelids exhibit some common characteristics. They are typically small animals with elongated bodies, short legs, short, round ears, Panda Bears Vs Environment thick fur. With the exception of the sea otter[7] they have anal scent glands that produce a strong-smelling secretion the animals use for sexual signaling and for marking territory.

Most mustelid reproduction involves embryonic diapause. No development takes place as long as the embryo remains unattached to the uterine lining. As a result, the normal gestation period is extended, sometimes up to a year. This allows the young to be born under more favorable environmental conditions. Reproduction has a large energy cost and it is to a female's benefit to have available food and mild weather. The young are more likely to survive if birth occurs after previous offspring have been weaned. Mustelids are predominantly carnivorous, although some eat vegetable Panda Bears Vs Environment at times. While not all mustelids share an identical dentitionthey all possess teeth adapted for eating flesh, including the presence of shearing carnassials.

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With variation between species, the most common dental formula is 3. The fishertayra and martens are partially arborealwhile badgers are fossorial. A number of mustelids Panda Bears Vs Environment aquatic lifestyles, ranging from semiaquatic minks and river otters to the fully aquatic sea otter. The sea otter is one of the few non-primate mammals known to use a tool while foraging.

It uses "anvil" stones to crack open the shellfish that form a significant part of its diet. It is a " keystone species ", keeping its prey populations in balance so some do not outcompete the others and destroy the kelp in which they live. The black-footed ferret is entirely dependent on another keystone species, the prairie dog.

A family of four ferrets eats prairie dogs in a year; this requires a stable population of prairie dogs from an area of some acres 2. Skunks were formerly included as a subfamily of the Panda Bears Vs Environment, but are now regarded as a separate family Mephitidae. Because mongooses and mustelids occupy similar ecological niches see more, convergent evolution has led to similarity in form and behavior. It is not clear which of these forms are Mustelidae ancestors and which should be considered the first mustelids. The fossil record indicates that mustelids appeared in the late Oligocene period 33 mya in Eurasia and migrated to every continent except Antarctica and Australia all the continents that were connected during or since the early Miocene.]