Something I've wanted for a while. Fur genes. It would have various effects.   Medium Fur: +1 Heat Resistance, +1 Cold Resistance (Unlocked at start) Thick Fur: +2 Cold Resistance, +1 Defense, -1 Heat Resistance (Travel to the mountains) Thin Fur: +2 Heat Resistance, +1 Scentless, -1 Cold Resistance (Travel to the savanna or jungle) Slick Fur: +2 Cold Resistance, +1 Swimming (Perform Swim 50 times) Feathers: +1 Heat Resistance, +1 Cold Resistance, +2 Flight (Invite