a large fire beetle

• -657, 79, -40 (seen once)
• -2199, -551, -53 (seen once) (1 of 2 spawns here)
• -2242, 776, -64 (seen once)
• -1592, -446, -49 (seen once) (1 of 2 spawns here)
• -1167, -130, -54 (seen once)
• -1055, 244, -28 (seen once) (1 of 2 spawns here)
• -1257, -662, -50 (seen once) (1 of 3 spawns here)
• -2022, -439, -50 (seen once) (1 of 6 spawns here)
• -1983, -89, -63 (seen once)
• -2047, 177, -65 (seen once) (1 of 7 spawns here)
• -478, 105, -35 (seen once) (1 of 7 spawns here)
• -2311, 322, -46 (seen once) (1 of 5 spawns here)
• -1998, 766, -29 (seen once) (1 of 4 spawns here)
• -1066, -717, -58 (seen once) (1 of 4 spawns here)
• -1577, -246, -42 (seen once) (1 of 3 spawns here)
• -1535, -9, -41 (seen once) (1 of 2 spawns here)
• -2117, 805, -63 (seen once)
• -1124, -580, -78 (seen once) (1 of 2 spawns here)
• -2183, -418, -50 (seen once) (1 of 5 spawns here)
• -1178, -64, -57 (seen once)
• -2182, 254, -74 (seen once) (1 of 3 spawns here)
• -1597, -767, -44 (seen once) (1 of 3 spawns here)
• -767, -533, -51 (seen once)
• -909, 122, -21 (seen once)
• -2222, -771, -76 (seen once) (1 of 6 spawns here)
• -639, -505, -46 (seen once)
• -2042, 601, -17 (seen once)
• -1676, 753, -64 (seen once) (1 of 2 spawns here)
• -1531, 780, -49 (seen once)
• -1530, 1045, -45 (seen once) (1 of 2 spawns here)

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.