Minecraft has various kinds of animals like cows, sheep, pigs, wolves, cats, cod, salmon, squid, polar bears, etc. Each of them has its own behavior and can interact with players in different ways.

the mod works fine, but seems to have some kind of issue with the DynamicTextureLoader, causes only the modifier items to be a black and purple missing texture icon. inside the debug log, there are ...

When making a custom tree for a custom biome, they will generate everywhere, no matter what is the block. They generate normally on the ground, but they also generate in rivers, lakes and in caves.