a swamp alligator

• -1695, 249, -16 (2 of 4 spawns here)
• 2122, 733, -42 (seen once) (2 of 3 spawns here)
• 2055, 1001, -29 (seen once)
• 2069, 894, -31 (seen once)
• 2039, 731, -49 (seen once) (1 of 2 spawns here)
• 1964, 1591, -38 (seen once)
• 2218, 162, -27 (seen once) (1 of 2 spawns here)
• 1386, 1028, -25 (seen once) (1 of 2 spawns here)
• 1990, -129, -15 (seen once)
• 1180, 1633, -15 (seen once)
• 1009, 736, -31 (seen once)
• 751, 968, -32 (seen once)
• -73, 1093, -31 (seen once)
• 331, -509, -20 (seen once) (1 of 2 spawns here)
• -485, 957, -31 (seen once)
• -1563, 1245, -32 (seen once)
• -1274, -588, -30 (seen once)
• -1532, -493, -31 (seen once)
• 1986, 1166, -22 (seen once)
• 1933, 1140, -29 (seen once)
• 2118, 669, -44 (seen once)
• 1970, 835, -35 (seen once)
• 2196, 553, -31 (seen once)
• 2163, 561, -32 (seen once)
• 2194, 431, -15 (seen once)
• 1646, 905, -31 (seen once) (1 of 3 spawns here)
• 2109, 231, -27 (seen once)
• 1457, 798, -33 (seen once)
• 1326, 614, -25 (seen once) (1 of 3 spawns here)
• 646, -80, -30 (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.