NPCs composing that spawngroup :

a_cave_bat (50%)

a_cave_bat (50%)

NPCs spawning around that spawngroup :
(Max range : 100)

warrens_62, range=6 (670,-154,-80)

a_kobold_sentry (50%)
a_rabid_kobold (50%)

warrens_63, range=37 (700,-138,-79)

warrens_68, range=94 (614,-229,-80)

a_kobold_guard (50%)
a_rabid_kobold (50%)

warrens_141, range=36 (692,-126,-80)

a_cave_bat (50%)
a_cave_bat (50%)

warrens_143, range=77 (663,-73,-80)

a_cave_bat (33%)
a_cave_bat (33%)
a_cave_bat (34%)

warrens_173, range=85 (691,-69,-79)