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In Germany, the Eurasian otter is nearly extinct in the wild, being listed as critically endangered. As part of a protection and conservation effort the "Aktion Fischotterschutz" was founded in 1979, which aims to fund habitat protection and expansion. [ 37 ]
Several otter species live in cold waters and have high metabolic rates to help keep them warm. Eurasian otters must eat 15% of their body weight each day, and sea otters 20 to 25%, depending on the temperature. In water as warm as 10 °C (50 °F), an otter needs to catch 100 g (3.5 oz) of fish per hour to survive.
Habitats vary widely as well, from the arboreal marten to the fossorial European badger to the marine sea otter. Population sizes are largely unknown, though two species, the sea mink and Japanese otter , were hunted to extinction in 1894 and 1979, respectively, and several other species are endangered .
However, during the winter and in colder environments, fish consumption is significantly lower and the otters use other resources for their food supply. Their diets can consist of amphibians (mainly frogs and pond turtles), bird predation (mainly anserine species), small rodents , and invertebrates such as water beetles, snails, and crayfish.
"The otters are a just super voracious predator," said Kerstin Wasson, research coordinator with the Reserve. "We calculated that the current otter population here eats somewhere between 50,000 ...
The near-threatened Eurasian otter The maned wolf is near-threatened largely as the result of habitat loss. The gray bat was moved from "endangered" to "near-threatened" due to successful conservation efforts.
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.
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