Whitetails have another advantage over their western ungulate counterparts: they are the most successful, adaptive breeders of North American deer, even in the presence of predators. Unless their populations are depressed from winterkills or EHD outbreaks, they seem to weather predation well. For example, in Northwestern Montana's North Fork Flathead River Country, where wolves and whitetails have lived together since long before the federal wolf reintroduction efforts of the mid 90s, game managers benefit from perspective lent by the passage of time. In the presence of wolves that prey often on whitetails, deer populations in the North Fork Flathead Drainage have been excellent, achieving population highs in between severe winter effects that have knocked down numbers at times. Along with wolves, these whitetails live with the full suite of predators, including grizzlies.