Eurasian eagle-owl
Even those near the northern limits of their range, where winters are harsh and likely to bear little in food, the eagle-owl does not leave its native range. There are cases from Russia of Eurasian eagle-owls moving south for the winter, as the icebound, infamously harsh climate there is too severe even for these hardy birds and their prey. Similarly, Eurasian eagle-owls living in the Tibetan highlands and Himalayas may in some cases vacate their normal territories when winter hits and move south. Even in those two examples, there is no evidence of consistent, annual migration by Eurasian eagle-owls and the birds may eke out a living on their normal territories even in the sparsest times.
Red fox
In Eurasia, red foxes may be preyed upon by leopards, caracals and Eurasian lynxes. The lynxes chase red foxes into deep snow, where their longer legs and larger paws give them an advantage over foxes, especially when the depth of the snow exceeds one metre. In the Velikoluki district in Russia, red foxes are absent or are seen only occasionally where lynxes establish permanent territories. Researchers consider lynxes to represent considerably less danger to red foxes than wolves do. North American felid predators of red foxes include cougars, Canadian lynxes and bobcats. Occasionally, large raptors such as Eurasian eagle owls will prey on young foxes, while golden eagles have been known to kill adults.