Spawns at -26, -197, -128 (seen once) (1 of 9 spawns here) -107, 172, -128 (seen once) (1 of 7 spawns here) -33, 131, -128 (seen once) (1 of 2 spawns here) -172, -157, -116 (seen once) (1 of 2 spawns here) -168, -263, -111 (seen once) (1 of 2 spawns here) -132, -288, -92 (seen once) (1 of 6 spawns here) 214, 61, -128 (seen once) (1 of 2 spawns here) -89, -133, -128 (seen once) (1 of 8 spawns here) -132, -195, -46 (seen once) (1 of 8 spawns here) -163, -171, -56 (seen once) (1 of 2 spawns here)
Show 7 more spots
As /loc gives them: Y, X, Z, the most used first; nearby spawns share a spot, and one seen in a single visit may be where the mob had been pulled to.