Quick Answer
Mule deer primarily rely on shrubs and trees for food during winter, including sagebrush, bitterbrush, and oak. They also consume grasses and forbs, but these become less available due to snow cover. Deer may travel long distances to reach these winter food sources.
Understanding Mule Deer Winter Nutrition
Mule deer are well-adapted to survive winter conditions, but their nutritional needs are still crucial for maintaining body condition and energy reserves. In the backcountry, identify key shrub species like big sagebrush (Artemisia tridentata) and mountain mahogany (Cercocarpus montanus), which provide essential nutrients and energy. Look for dense stands of these shrubs, typically found on south-facing slopes that receive full sun.
Locating Winter Food Sources
To locate winter food sources, focus on areas with dense shrub cover, often associated with rocky outcroppings, talus fields, or old burns. These areas tend to retain more snow-free habitats than open meadows or grasslands. For example, in the Rocky Mountains, consider searching for wintering mule deer around burned areas from previous years, where shrubs like sagebrush and bitterbrush are more abundant.
Winter Deer Behavior and Patterns
During the winter months, mule deer often form small groups, typically consisting of females and their fawns, while bucks may wander further afield in search of mates or more abundant food sources. Observe deer movement patterns closely, noting the time of day and year when they tend to feed on specific shrubs or forbs. For example, in areas with high snow cover, mule deer may shift their feeding patterns to earlier morning or late evening to avoid harsh midday conditions.
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