The three biomes (Desert, Plain, Tundra) need more animal diversity.

[TerraNovaClick]

It really sucks to have such scattered animal spawns; any vanilla setting has them clustered in strange ways. Deserts are full of animals, but the snow lacks animals and hemp, so cloth/etc is a bloody pain to get. I was thinking that we could use a few more animal types.

Plains: Coyotes, Chickens, Deer, Horses, Black Bears, Pigs.

Desert: Dingo, Lizards, Gazelle, Camels, Brown Bears, Boar.

Tundra: Wolves, Hares, Elk, Moose, Polar Bears, Mountain Goats.

Basically, replace some of the existing types with an alternative.
I.E:

Wolf: Coyote, Dingo
Deer: Elk, Gazelle
Horses: Camel, Moose
Chicken: Lizard, Hare
Bear: Black/Brown/Polar.
Boar: Pig/Goat.

Some of the mechanics could be changed, as well. Chickens would continue to spawn in groups, but give less overall than, say, lizards, who would be more independent. Pigs would be non-hostile, but boars would be aggressive. It feels like a shame just to see the same, boring animals all over; - Especially with how unbalanced it is. Whenever I live in the snow, I don't find very many animals. Perhaps this is misfortune on my half, but it has almost always been the case. Plus, a little variety can't hurt, right?

Then just fix up the animal spawns so you only get the specific types in each area.

[MarcoMontana]

We need Water predators, Sharks, Eels, Jelly fish, Barracudas...