The mod adds a variety of animals including:

Saiga - An antilope that drops mutton and lives in the desert, meadow and snowy plains. It is breedable with any grass;
Stargazer - A big fish that is neutral, living in mangrove swamps, warm and lukewarm oceans (including the deep varient). It will prey on tropical fish having a chance to drop prismarine crystals when killing one. It can be transported in a bucket;
Turtle Frog - A small frog that calls the desert and beach home. It drops smileballs when killed, but why would you do that. It is breedable with spider eyes or roundworms. It can be picked up with a bowl. JUST DON'T EAT IT;
Whip Spider - A fast and hostile varient of the spider that spawns in dark forests, jungles and dripstone caves. It only gives spider eyes when killed.

The mod also adds new plants, like:

Clovers - Plains, normal, dark, birch and old growth birch forests, meadow and windswept forest, hills and gravelly hills;
Dried Grass - Badlands, desert, savanna and savanna plateau;
Frost Grass - Grove, frozen river and snowy plains, slopes, beach and taiga;
Pampas Grass - Beach, wooded badlands and windswept savanna;
Rafflesia - Jungle (the rarest plant in the mod);
Royal Fern - River, mangrove and normal swamp and normal and sparse jungles.

Other things are:

Red Algae - Normal and frozen rivers and cold and frozen oceans (including deep varients);
Bleeding Tooth Mushroom - Mushroom fields, dark forest and nomal, old growth pine and spruce taigas;
Giant Bleeding Tooth Mushroom - Mushroom fields and dark forest;
Roundworm - Has a chance to drop when killing farm animals;
Royal, Lucky and Therapeutic Soups - All crafted wit a specific mushroom and another ingredient, giving a buff and debuff when eaten.

Feel free to comment your ideas or mechanics you think should be in the mod.

Allosphere