NPCs composing that spawngroup :

thick_boned_skeleton (100%)

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

kurn_9, range=38 (0,13,3)

scalebone_skeleton (100%)

kurn_18, range=35 (-70,30,-39)

Burynai_excavator (100%)

kurn_34, range=79 (21,86,-116)

lesser_charbone_skeleton (100%)

kurn_44, range=26 (-9,29,-116)

kurn_68, range=74 (22,-17,-118)

kurn_72, range=91 (-83,-48,-107)

Burynai_excavator (100%)

kurn_74, range=82 (38,70,-116)

kurn_91, range=23 (-30,8,-39)

kurn_92, range=99 (11,-57,-39)

kurn_113, range=93 (-114,-19,-22)

Burynai_burrower (50%)
Burynai_excavator (50%)

kurn_132, range=47 (-8,70,-39)

Burynai_excavator (50%)
Burynai_sapper (50%)

kurn_133, range=48 (-51,77,-39)

kurn_134, range=57 (-84,61,-39)

Burynai_Excavator (50%)
Burynai_Excavator (50%)

kurn_136, range=97 (-84,-53,-30)

kurn_149, range=35 (-63,9,-30)

kurn_150, range=86 (-111,72,-39)

Burynai_excavator (100%)

kurn_151, range=72 (-106,18,-39)

kurn_152, range=67 (-88,-11,-30)

kurn_153, range=49 (-62,-10,-30)

kurn_160, range=34 (-53,1,9)

greater_skeleton (100%)

kurn_166, range=17 (-50,39,104)

kurn_170, range=95 (22,-46,131)

kurn_183, range=99 (-62,-65,129)

greater_skeleton (100%)
greater_skeleton (100%)

kurn_184, range=58 (-85,61,106)

greater_skeleton (50%)
scalebone_skeleton (50%)

kurn_185, range=43 (-39,-12,104)

kurn_186, range=65 (-58,-30,104)

kurn_187, range=65 (13,-13,104)

kurn_188, range=22 (-13,29,104)

greater_skeleton (50%)
scalebone_skeleton (50%)

kurn_192, range=35 (0,31,-39)

fingered_skeleton (20%)
thick_boned_skeleton (80%)

#Crackling_Bones_189490, range=49 (-31,80,-39)

#Crackling_Bones (25%)
lesser_charbone_skeleton (75%)