Key words: Alaska, body mass, calf mortality, caribou, maternal penning, natality, population dynamics, population recovery, predation, Rangifer tarandus, sex ratio, survival, Yukon. [p. 14:] "Animal care and monitoring during captivity.—We provided caribou ad libitum a commercial pelleted ration formulated specifically for caribou (Barboza and Parker 2006, Thompson and Barboza 2014; ¯x = 2.9 kg dry/adult caribou/day) and terrestrial lichens ( ¯x = 0.5 kg dry/adult caribou/day) in plywood feeding troughs each morning and evening. Lichens were predominantly Cladonia arbuscula, C. mitis, and C. stellaris collected elsewhere and transported to pen facilities. Caribou also consumed native forages available within the pen." [p. 24:] "Diets of adult females in captivity.—Adult females placed in captivity quickly accepted the pelleted ration. Based on microhistological analyses of feces in 2006, the commercial feed constituted about 27% of the diet of females in the pen following their first week in captivity (Fig. 13A). The addition of the pelleted feed to their diets primarily resulted in a reduction in the proportion of lichen, which constituted 70% of the diet of free‐ranging caribou (Fig. 13A), even though we provided 0.5 kg dry lichen/caribou/day on average and additional lichen was naturally available in the pen."