Mammalian carnivores are potential competitors with golden eagles for food. Foxes may prey on the same species in a given area but, as they are occasionally hunted by the eagles and are mainly nocturnal, they tend to avoid direct conflicts. Though rare, golden eagles may sometimes pirate prey from various species of fox. In North America, coyotes (Canis latrans) may engage in agonistic interactions with golden eagles. Despite being around three times as heavy, lone coyotes are seemingly dominated by golden eagles at many carrion or kill sites. In the Greater Yellowstone, golden eagles were ranked as the second most dominant scavenger at wolf kills during winter (when bears are hibernating) after coyote packs but above bald eagles. In one instance, a healthy adult male coyote was attacked and killed by a golden eagle. This coyote weighed after the eagle had consumed some of its internal organs. Conflicts between golden eagles and Scottish wildcats have been reported on rare occasions. In one instance, a golden eagle trying to hunt some wildcat kittens was intercepted by the mother wildcat. In the ensuing violent battle, the wildcat mother and the eagle both died. In Northern California, golden eagles have pirated lambs killed by bobcats, a species which has itself occasionally turned up in the eagle's diet. Per one anecdote from the Himalayas, a golden eagle reportedly tried to predaceously attack a snow leopard (Panthera uncia) and was killed by the much larger felid, although this could have actually been a case of an overly bold eagle trying to displace a large predator from its own home range. Adult wolverines appear to be one of the few conspecific mammal carnivores to actively pose a threat to golden eagles. Wolverines were observed to prey on nestling golden eagles in Denali National Park. During incubation in Northern Sweden, an incubating adult golden eagle was killed on its nest by a wolverine. In Yellowstone National Park, one prey item amongst 473 recorded for cougars (Puma concolor) was a golden eagle, although no details of the attack or of the age of the bird were reported. Grizzly bears (Ursus arctos horribilis) have also reportedly killed and eaten golden eagle nestlings in Denali National Park. The grizzly is reportedly one of the few mammals to trigger a strong aggressive reaction from the parent eagles when spotted close to the nest, as eagles have been observed to strike the bruins about the head and neck with their talons.