Though 'gaggle' often refers to geese, it can describe other groups not following a leader. After the meeting dispersed, a gaggle of coworkers gathered by the watercooler.
Pro Tip 2/3
Usually Grounded
The term 'gaggle' specifically implies these birds are on the ground or water, not flying. We have to walk around the gaggle blocking the path.
Pro Tip 3/3
Active Groups
'Gaggle' often suggests that the group is active or noisy, not just standing still. The gaggle of geese honked as we tried to feed them.