NPCs composing that spawngroup :

scalebone_skeleton (100%)

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

kurn_8, range=63 (99,9,4)

kurn_16, range=80 (169,31,-134)

lesser_charbone_skeleton (50%)
lesser_icebone_skeleton (50%)

kurn_34, range=58 (156,-98,-103)

lesser_charbone_skeleton (100%)

kurn_39, range=92 (76,-113,-105)

kurn_40, range=35 (153,-74,-104)

kurn_56, range=65 (171,14,-120)

kurn_57, range=54 (188,-26,-118)

greater_scalebone (100%)

kurn_58, range=97 (180,46,-119)

Burynai_Excavator (50%)
Burynai_sapper (50%)

kurn_63, range=98 (43,-73,-108)

Burynai_excavator (100%)

kurn_64, range=71 (178,16,-120)

kurn_76, range=86 (223,-41,-118)

Burynai_excavator (50%)
Burynai_sapper (50%)

kurn_88, range=44 (155,-83,-24)

Burynai_burrower (50%)
Burynai_Excavator (50%)

kurn_94, range=73 (67,-19,-39)

kurn_97, range=12 (128,-51,-49)

kurn_98, range=33 (104,-44,-49)

kurn_99, range=30 (124,-14,-49)

kurn_107, range=33 (121,-71,-24)

kurn_109, range=66 (143,-108,-24)

kurn_114, range=55 (162,-92,-24)

kurn_160, range=83 (66,3,9)

greater_skeleton (100%)

kurn_174, range=89 (130,47,104)

kurn_180, range=56 (81,-49,129)

a_skeletal_cook (25%)
thick_boned_skeleton (75%)