Only spots I really know of is:
587, 810 - Young to Old (Mixed with Atrax and Prancer at times)
880, 821 - Mature to Alpha (Mixed with Young to Old Atrox)
871, 812 - Mature to Stalker (Mixed with Old to Domi Atrox)
All kinda low to medium ish density (some walking between spawns at times)...