Genetic Animals is a more realistic imagining of how the animals in Minecraft should behave and look like in regards to the biome they spawn in. It also requires the player to be more responsible over their farms in order for the animals to thrive. Right away you’ll notice the new designs of each animal with new patterns and colors and a wide variety of sizes. Pigs have a more realistic design and are typically much darker in color. You can even breed animals from different biomes to create new variations!
Chickens are very noticeably different and look much more natural. This mod also adds a post specifically for chicken coops. It looks like a standard fence post but it can be placed horizontally and the chickens will naturally perch on them.
This mod does add some additional real-life environmental factors when it comes to feeding. Animals will naturally feed on tall grass and can subsequently cause sparse grass to form. This type of grass will actually turn back into normal grass quicker than before unless pigs are around.