I was hunting in Society Hill the first year they showed up on some of the Torbert property there……They moved in one really dry summer in the mid 2000’s….It may have been that 2007 year....The same area now 20 years later is just insanely covered up….Individual sounders might not be “dispersing” but the population growth that’s occurring is definitely expanding their footprints and I think it probably happens a lot when these drought cycles roll around. All of these built up population centers have to go find the remaining water and it probably pushes a lot of them into new territory where some of the end up staying.