Features of groups involved in fission.

FissionID and GroupID are the fission identity and Group identity respectively. Origin indicates whether the group is the initial pre-fission group or one of the two post-fission groups (i.e. PostF1 or PostF2). gp_size is group size and nM, nF, nY is the number of adult males, females and young respectively. sex_segr differentiates female-only (onlyF), male-only (onlyM) and mixed-sex groups (mixed). MGS and NDR are the mean group speed and net square displacement. NA corresponds to missing value. (PRN)