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The movements and space use of 7 yearling black bears (Ursus americanus) (3 males, 4 females) from 3 family groups were intensively monitored concurrently with 13 adults (6 males, 7 females) in the Cherokee National Forest, Tennessee from February 1983 until December 1983. The timing of family breakup occurred in 2 families between 29 May-5 June, and 22-25 June, respectively. The third family dissolved after the accidental death of the mother during immobilization at the den; the subsequent movements of the orphaned young were recorded. Reassociations between mother and offspring, and between siblings did occur after breakup. The mean summer home ranges of yearlings (n = 6) averaged 4 km2 while those of adult bears (n = 8) measured 11 km2. Fall ranges for yearlings were 20 km2 and for adults 77 km2. The intra-year seasonal ranges of yearlings increased significantly (P < 0.01) from summer to fall while the adult ranges did not (P > 0.10). Yearlings after separation from their mothers became progressively independent of their mothers' range. Mean distances between mothers and offspring, and between siblings after breakup, increased each month as family bonds began to weaken and exploratory movements took place. Six of 7 yearlings survived until the following winter although 1 shed his collar before denning and his fate was unknown; all other yearlings returned and located dens in their respective maternal home ranges.