An informal group is usally:

An Informal group is a group that is ONLY influenced by certain members IN that organization, no others can be in the group. Its a certain organization.

the most likely outcome of fewer loon territories is that hawks would increase in proportion because the benefit of victory would be greater. hawks and loons are natural rivals of resources and victories in the game, since the lakes drying up affected the loons, the hawks would be benefited from the drought.