NPCs composing that spawngroup :

Burynai_burrower (34%)

Burynai_Excavator (33%)

scalebone_skeleton (33%)

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

kurn_9, range=43 (-228,15,-23)

scalebone_skeleton (100%)

kurn_11, range=78 (-172,-30,4)

greater_scalebone (50%)
greater_skeleton (50%)

kurn_23, range=80 (-246,-101,-123)

kurn_112, range=16 (-248,-5,-23)

kurn_125, range=67 (-186,0,-23)

kurn_129, range=44 (-228,-60,-23)

Burynai_Excavator (100%)

kurn_154, range=86 (-164,-32,-23)

Burynai_Excavator (50%)
Burynai_excavator (50%)

kurn_158, range=81 (-184,-69,-23)

kurn_160, range=69 (-183,-38,6)

greater_skeleton (100%)

kurn_179, range=95 (-170,31,4)