Alright, there are things I think could be a great thing to add to Minecraft to make it more realistic. Mob Adaptations. These make Mobs look more thriving in all of the biomes, depending on which biome they spawn in.
Animals
Cow: in forest cow's texture would be the same, and another addition to the white and black cow would be added in this topic. Also in swamps, they would look the same except somewhat muddy and swampy. Since cows dont really spawn on desserts often, i have nothing to say about that. Last but not least in jungles they have dark greenish textures on their body.
Pig: Pigs have the same thing as in the cow. But instead in swamps pigs would look dark pink. In snow biomes Pigs will have grey fur (looking kind of like a sheep)
Sheep: Sheep would have dark green stains in their wool, if they are in the swamp. Also in jungles their wool looks green and weedy, (what i mean by weedy, i mean slimy and leafy, just like the jungle tree leaves.) In snow biomes they can be seen having bits of snow.
Chicken: Chickens unlike the other animals don't have any change in their feathers, except only in the plains biome. Their feathers would be red, like ordinary chickens, and baby chickens will have yellow feathers.
Wolves: Wolves in forests will have brown, or grey fur. In snow biomes their fur looks like its original texture.
Squids: nothing changed.
Ocelot: nothing changed.
Monsters Creeper: In deserts, they would look all scratchy and crunchy, And their color would look like the one when you place leaves in the desert biome. Also In jungles they look all slimy, and wet. In snow biomes they would look like snow bits are in their skin. Also they will look furry in a way. In plains and forests, and in mountain biomes, nothing is changed.
Zombie: Zombie's skins would look dry and green-yellowish in desert biomes, looking like if a human died of thirst. Also their clothes would looked all ripped and scraggly. Also in the desert temple they look like mummies. this happens when they spawn on and type of sandstone blocks. Also in jungles their skin is light green, and they have a muddy clothes, this is also included in swamps. In snow biomes their skin is is white-green, with blue eyes. (based on the white walkers from game of thrones)
Skeleton: Skeletons when spawning in deserts their skin looks rusty, also i added a "cook effect" that they wear a raggy cape, which is a rag, to make them seem more desert friendly. In snow biomes: nothing changed. In jungles and swamps they have vines growing from their bones.
Enderman: Endermen will now look grey in snow biomes. Also they could look dark green in swamps and jungles, and have vines growing on them.
slime: In swamps they have would have different shades of green.
Spider: spiders will look like a tarantula in sand biomes. And in jungles they are yellow. A yellow spider.
Golems Iron Golem: Now this depends on wear you build them, Iron golems in deserts would look like iron that is damaged. In snow biomes, they look wet and shiny. In plains, forests, and mountain biomes, nothing is changed. Golems will look more ancient and they would obtain more vines if they are spawned in swamps and jungles.
*BTW a Golem is actually a Jewish Folklore from A LONG TIME AGO.....
Like the idea, think there should be something about biome related mobs, but your just asking to retexture them for each biome. No change in gameplay whatsoever. Maybe if the swamp ones had more health, or the jungles ones dropped more goods (because there's a lot to eat and they get fat) then that could worth changing, but even still with those changes, no support.
Animals
Cow: in forest cow's texture would be the same, and another addition to the white and black cow would be added in this topic. Also in swamps, they would look the same except somewhat muddy and swampy. Since cows dont really spawn on desserts often, i have nothing to say about that. Last but not least in jungles they have dark greenish textures on their body.
Pig: Pigs have the same thing as in the cow. But instead in swamps pigs would look dark pink. In snow biomes Pigs will have grey fur (looking kind of like a sheep)
Sheep: Sheep would have dark green stains in their wool, if they are in the swamp. Also in jungles their wool looks green and weedy, (what i mean by weedy, i mean slimy and leafy, just like the jungle tree leaves.) In snow biomes they can be seen having bits of snow.
Chicken: Chickens unlike the other animals don't have any change in their feathers, except only in the plains biome. Their feathers would be red, like ordinary chickens, and baby chickens will have yellow feathers.
Wolves: Wolves in forests will have brown, or grey fur. In snow biomes their fur looks like its original texture.
Squids: nothing changed.
Ocelot: nothing changed.
Monsters
Creeper: In deserts, they would look all scratchy and crunchy, And their color would look like the one when you place leaves in the desert biome. Also In jungles they look all slimy, and wet. In snow biomes they would look like snow bits are in their skin. Also they will look furry in a way. In plains and forests, and in mountain biomes, nothing is changed.
Zombie: Zombie's skins would look dry and green-yellowish in desert biomes, looking like if a human died of thirst. Also their clothes would looked all ripped and scraggly. Also in the desert temple they look like mummies. this happens when they spawn on and type of sandstone blocks. Also in jungles their skin is light green, and they have a muddy clothes, this is also included in swamps. In snow biomes their skin is is white-green, with blue eyes. (based on the white walkers from game of thrones)
Skeleton: Skeletons when spawning in deserts their skin looks rusty, also i added a "cook effect" that they wear a raggy cape, which is a rag, to make them seem more desert friendly. In snow biomes: nothing changed. In jungles and swamps they have vines growing from their bones.
Enderman: Endermen will now look grey in snow biomes. Also they could look dark green in swamps and jungles, and have vines growing on them.
slime: In swamps they have would have different shades of green.
Spider: spiders will look like a tarantula in sand biomes. And in jungles they are yellow. A yellow spider.
Golems
Iron Golem: Now this depends on wear you build them, Iron golems in deserts would look like iron that is damaged. In snow biomes, they look wet and shiny. In plains, forests, and mountain biomes, nothing is changed. Golems will look more ancient and they would obtain more vines if they are spawned in swamps and jungles.
*BTW a Golem is actually a Jewish Folklore from A LONG TIME AGO.....
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Also, here is an awesome suggestion I had: http://www.minecraftforum.net/topic/1745550-biome-effects/