A. Both morphine-sired male rats (n = 10, from 10 sires) and saline-sired male rats (n= 10, from 10 sires) show an increase in the latency to approach and consume peanut butter chips in a novel environment. B. Morphine-sired female rats (n = 7, from 7 sires) and saline-sired female rats (n= 6, from 6 sires) show a similar increase in latency to consume peanut butter chips in a novel environment. C. Morphine-sired male rats (n = 12, from 6 sires) do not show a difference in the amount of time spent burying compared to saline-sired male rats (n = 12, from 6 sires). D. Morphine-sired female rats (n = 8, from 4 sires) do not show a difference in the amount of time spent burying compared to saline-sired female rats (n = 8, from 4 sires). Data shown mean ± SEM. * p<0.05