Since 1.7 added new biomes, More Nature is adding support to these new biomes. Here is a spawn list:
Centipede: Forest, Swampland, Birch Forest, Roofed Forest, Mega Taiga, Jungle
Cricket: Plains, Swampland, Jungle, Savanna
Butterfly: Plains, Swampland, Jungle, Savanna
Fish: Ocean, River, Frozen Ocean, Frozen River, Deep Ocean, Swampland
Angler: Deep Ocean
Manta Ray: Ocean, Deep Ocean, Swampland
Whale: Deep Ocean
Snake: Jungle, Swampland, Savanna, Desert, Mesa
Lizard: Jungle, Savanna, Desert, Mesa
Mouse: Plains, Forest, Birch Forest, Mega Taiga
Bird: Plains, Forest, Swampland, Jungle, Birch Forest, Mega Taiga