For some reason, I spent a while tallying up creature diversity in every biome. If somebody wants to read over the results, here they are.
Desert:26 normal creatures, 104 Savage, 1 evil. 30 normal vermin, 1 savage, 3 good, 2 evil.
Tagia:20 normal creatures, 80 savage, 2 good, 2 evil. 25 normal vermin, 2 savage, 3 good, 3 evil.
Temperate Broadleaf:33 normal creatures, 131 savage, 2 good, 1 evil. 38 normal vermin, 2 savage, 3 good, 3 evil.
Temperate Coniferous:33 normal creatures, 125 savage, 1 good, 0 evil. 35 normal vermin, 2 savage, 3 good, 3 evil.
Tropical Moist broadleaf:44 normal creatures, 115 savage, 1 good, 1 evil. 33 normal vermin, 2 savage, 3 good, 3 evil.
Tropical dry broadleaf:28 normal creatures, 105 savage, 2 good, 1 evil. 31 normal vermin, 1 savage, 3 good, 3 evil.
Tropical Coniferous:26 normal creatures, 105 savage, 2 good, 1 evil. 32 normal vermin, 1 savage, 3 good, 3 evil.
Glacier:1 normal creature, 3 savage, 2 evil. 0 normal vermin, 1 savage, 3 good.
Temperate Grassland:27 normal creatures, 110 savage, 2 evil. 34 normal vermin, 1 savage, 3 evil and 3 good.
Tropical Grassland:29 normal creatures, 100 savage, 2 evil. 29 normal vermin, 1 savage, 3 evil and 3 good.
Temperate Freshwater Lake:15 normal creatures, 20 savage. 10 normal vermin, 2 good.
Temperate Brackish Lake:14 normal creatures, 18 savage. 3 normal vermin, 2 good.
Temperate Saltwater Lake:10 normal creatures, 16 savage. 3 normal vermin, 2 good.
Tropical Freshwater Lake:9 normal creatures, 12 savage. 7 normal vermin, 2 good.
Tropical Brackish Lake:7 normal creatures, 12 savage. 5 normal vermin, 2 good.
Tropical Saltwater Lake:7 normal creatures, 12 savage. 5 normal vermin, 2 good.
Mountain:12 normal creatures, 25 savage, 1 good, 1 evil. 1 savage vermin, 3 good.
Temperate Freshwater Pool:8 normal vermin, 2 savage, 1 evil.
Temperate Brackish Pool:7 normal vermin, 2 savage, 1 evil.
Temperate Saltwater Pool:7 normal vermin, 2 savage, 1 evil.
Tropical Freshwater Pool:8 normal vermin, 2 savage, 1 evil.
Tropical Brackish Pool:8 normal vermin, 2 savage, 1 evil.
Tropical Saltwater Pool:8 normal vermin, 2 savage, 1 evil.
Arctic Ocean:25 normal creatures, 37 savage, 1 good, 1 evil. 12 normal vermin, 2 good.
Temperate Ocean:32 normal creatures, 25 savage, 1 good, 1 evil. 22 normal vermin, 2 good.
Tropical Ocean:35 normal creatures, 23 savage, 1 good, 1 evil. 11 normal vermin, 2 good.
Temperate Freshwater River:14 normal creatures, 16 savage. 9 normal vermin.
Temperate Brackish River:13 normal creatures, 16 savage. 6 normal vermin.
Temperate Saltwater River:8 normal creatures, 12 savage. 6 normal vermin.
Tropical Freshwater River:10 normal creatures, 12 savage. 4 normal vermin.
Tropical Brackish River:8 normal creatures, 11 savage. 3 normal vermin.
Tropical Saltwater River:8 normal creatures, 11 savage. 3 normal vermin.
Temperate Savanna:23 normal creatures, 102 savage, 2 evil. 34 normal vermin, 1 savage, 3 good, 2 evil.
Tropical Savanna:29 normal creatures, 111 savage, 2 evil. 30 normal vermin, 1 savage, 3 good, 2 evil.
Temperate Shrubland:29 normal creatures, 109 savage, 1 good, 2 evil. 33 normal vermin, 1 savage, 3 good, 2 evil.
Tropical Shrubland:30 normal creatures, 105 savage, 1 good, 2 evil. 30 normal vermin, 1 savage, 3 good, 2 evil.
Tundra:14 normal creatures, 27 savage, 2 evil. 1 savage vermin, 3 good.
Temperate Freshwater Marsh:16 normal creatures, 67 savage, 3 evil. 30 normal vermin, 1 savage, 3 good, 2 evil.
Temperate Saltwater Marsh:15 normal creatures, 63 savage, 3 evil. 29 normal vermin, 1 savage, 3 good, 2 evil.
Temperate Freshwater Swamp:14 normal creatures, 67 savage, 1 evil. 29 normal vermin, 1 savage, 3 good, 2 evil.
Temperate Saltwater Swamp:13 normal creatures, 63 savage, 1 evil. 28 normal vermin, 1 savage, 3 good, 2 evil.
Tropical Freshwater Marsh:17 normal creatures, 67 savage, 3 evil. 27 normal vermin, 1 savage, 3 good, 2 evil.
Tropical Saltwater Marsh:16 normal creatures, 65 savage, 3 evil. 27 normal vermin, 1 savage, 3 good, 2 evil.
Tropical Freshwater Swamp:18 normal creatures, 67 savage, 1 evil. 27 normal vermin, 1 savage, 3 good, 2 evil.
Tropical Saltwater Swamp:17 normal creatures, 65 savage, 1 evil. 27 normal vermin, 1 savage, 3 good, 2 evil.
Mangrove Swamp:20 normal creatures, 71 savage, 1 evil. 28 normal vermin, 1 savage, 3 good, 2 evil.
Cavern Level 1:31 creatures, 7 vermin.
Cavern Level 2:41 creatures, 9 vermin.
Cavern Level 3:35 creatures, 3 vermin.
Cavern Level 4:4 creatures, 1 vermin.
Underworld:Demons.
I hadn't realized just how many more types of creatures there are in most Savage biomes before.