NPCs composing that spawngroup :

greater_skeleton (100%)

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

kurn_4, range=90 (15,-58,127)

an_odd_mole (100%)

kurn_9, range=54 (0,13,3)

scalebone_skeleton (100%)

kurn_18, range=34 (-70,30,-39)

Burynai_excavator (100%)

kurn_44, range=52 (-9,29,-116)

kurn_57, range=96 (19,-63,134)

greater_scalebone (100%)

kurn_68, range=77 (22,-17,-118)

kurn_71, range=76 (-41,-75,-107)

kurn_72, range=56 (-83,-48,-107)

Burynai_excavator (100%)

kurn_90, range=77 (-75,-73,-30)

kurn_91, range=24 (-30,8,-39)

kurn_92, range=86 (11,-57,-39)

kurn_93, range=96 (29,-50,-39)

Burynai_excavator (100%)

kurn_111, range=94 (-146,-18,-23)

Burynai_Excavator (100%)

kurn_113, range=64 (-114,-19,-22)

Burynai_burrower (50%)
Burynai_excavator (50%)

kurn_117, range=88 (-31,-85,-30)

Burynai_Excavator (50%)
Burynai_Excavator (50%)

kurn_132, range=82 (-8,70,-39)

Burynai_excavator (50%)
Burynai_sapper (50%)

kurn_133, range=76 (-51,77,-39)

kurn_134, range=67 (-84,61,-39)

Burynai_Excavator (50%)
Burynai_Excavator (50%)

kurn_135, range=86 (-138,19,-39)

kurn_136, range=62 (-84,-53,-30)

kurn_149, range=12 (-63,9,-30)

kurn_150, range=92 (-111,72,-39)

Burynai_excavator (100%)

kurn_151, range=55 (-106,18,-39)

kurn_152, range=37 (-88,-11,-30)

kurn_153, range=14 (-62,-10,-30)

kurn_166, range=38 (-50,39,104)

kurn_170, range=88 (22,-46,131)

kurn_183, range=65 (-62,-65,129)

greater_skeleton (100%)
greater_skeleton (100%)

kurn_184, range=68 (-85,61,106)

greater_skeleton (50%)
scalebone_skeleton (50%)

kurn_185, range=19 (-39,-12,104)

kurn_186, range=31 (-58,-30,104)

kurn_187, range=67 (13,-13,104)

kurn_188, range=48 (-13,29,104)

greater_skeleton (50%)
scalebone_skeleton (50%)

kurn_192, range=61 (0,31,-39)

fingered_skeleton (20%)
thick_boned_skeleton (80%)

kurn_193, range=35 (-35,31,-39)

thick_boned_skeleton (100%)

#Crackling_Bones_189490, range=82 (-31,80,-39)

#Crackling_Bones (25%)
lesser_charbone_skeleton (75%)