Fig 3. Mean estimated macronutrient content, as a percentage of daily digestible energy, for the 14 daily diet types of grizzly and black bears identified by principal component and cluster analyses of foraging data collected during site visits of bear locations during a 24-hour period, Grand Teton National Park and vicinity, Wyoming, USA, 2004–2006.

Foods were categorized into 7 primary food types (e.g., above-ground vegetation [AGBVEG], below-ground-vegetation [BGVEG]). The dashed line depicts the optimal protein level (17 ± 4%) that has been shown to maximize body mass gain per unit of energy intake [8].