giant water moccasin

• 1139, -27, -24 (2 of 3 spawns here)
• 1840, 1505, -36 (2 of 4 spawns here)
• 2285, -12, -27 (seen once)
• 1073, 1244, -28 (seen once)
• 1069, 75, -29 (seen once) (1 of 2 spawns here)
• 2265, 1509, -28 (seen once) (1 of 3 spawns here)
• 1985, 1268, -18 (seen once)
• 1844, 1055, -28 (seen once)
• 1699, 1257, -31 (seen once)
• 1433, 771, -32 (seen once)
• 1441, 682, -34 (seen once)
• 1835, 50, -23 (seen once)
• 2103, -91, -33 (seen once)
• 1557, 83, -27 (seen once)
• 943, 978, -25 (seen once) (1 of 3 spawns here)
• 1315, 98, -27 (seen once)
• 1124, 153, -32 (seen once) (1 of 2 spawns here)
• 782, 1235, -31 (seen once) (1 of 2 spawns here)
• 572, 65, -19 (seen once) (1 of 2 spawns here)
• 531, 1592, -29 (seen once)
• 1703, 241, -11 (seen once) (1 of 2 spawns here)
• 386, -2, -34 (seen once) (1 of 3 spawns here)
• 2108, 480, -30 (seen once)
• 2026, 536, -32 (seen once)
• 1288, 1330, -30 (seen once) (1 of 2 spawns here)
• 1229, 845, -25 (seen once) (1 of 2 spawns here)
• 1046, 1139, -31 (seen once) (1 of 2 spawns here)
• 912, 270, -34 (seen once)
• 1019, 15, -18 (seen once)
• 628, 484, -26 (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.