Both of these females showed signs of previous
nursing when captured the following autumn based on
elongated nipples (nipples were not elongated in yearlings
that did not nurse). Although one or both of these
yearlings could have been pseudopregnant and nursed
another’s pups without giving birth, we also assumed that
both had given birth and were a polygynous group.
Overall, the females within each polygynous group appeared
to be of the same age, indicating that they may
have been sisters