Years and seasons during which we monitored various packs for prey acquisition rate and probability of attendance (PA).

The seasons that we monitored various packs were late winter (L), summer (S), and early winter (E). We determined PA for two wolves in each pack during every season that a pack was monitored except for summer periods marked as S1. During summer periods marked as S1, only one GPS-collared wolf was present in the pack. We determined prey acquisition rates during all summer periods that we monitored a pack of wolves.