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Delayed implantation distinguishes the species from the Eurasian otter, which does not do this. [41] [42] In early spring, expectant mothers begin to look for a den where they can give birth. The female otters do not dig their own dens; instead, they rely on other animals, such as beavers, to provide suitable environments to raise their offspring.
North American river otters usually give birth to one litter of pups a year, consisting of about three to four pups per litter. Though they often give birth as long as a year after mating, they ...
At least 42 instances of attack were found, including one resulting in death and another case of serious injury. Attacking otters had rabies in 36% of anecdotal reports. [32] 80% of otter bite victims do not seek medical treatment. [33] Animal welfare groups say that, unless threatened, otters rarely attack humans. [34]
In some respects, though, the sea otter is more fully adapted to water than pinnipeds, which must haul out on land or ice to give birth. [15] The full genome of the northern sea otter (Enhydra lutris kenyoni) was sequenced in 2017 and may allow for examination of the sea otter's evolutionary divergence from terrestrial mustelids. [16]
The smooth-coated otter is a relatively large otter species, weighing from 7–11 kg (15–24 lb) and measuring around 59–64 cm (23–25 in) in head-body length with a 37–43 cm (15–17 in) long tail.
Rosa was adopted by the Monterey Bay Aquarium in 1999 and served as surrogate mother for a record 15 otters. She outlived the life expectancy for wild southern sea otters.
An otter at the St. Louis Aquarium in St. Louis, Missouri had one woman stressed. The poor thing was hungry! All he wanted was for one of the many guests at the aquarium that day to give him a snack.
Otter (Lutra sp.) 60 86 73 Pig (Sus domesticus) 112 115 113 ... There is a positive relationship between mass at birth and length of gestation in eutherian mammals. ...