I could not give you a scientific answer, but I believe it is because they happen the most in nature. They must be a simple combo. Making melanin or lack of making it(albino) happens in every species. It is probably the easiest to find, single out
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**********Misty**********
Stress is when you wake up screaming and then you realize that you haven't gone to sleep yet.
1.1.3 bearded dragons
0.1.0 water dragon
1.3.0 leopard geckos
12.20.0 corn snakes
1.1.0 jungle corns
2.3.0 king snakes
1.1.0 false water cobras
1.0.0 royal (Ball) pythons
0.1.0 kenyan sand boa
1.0.0 Sinaloan milk snake
0.1.0 Tri-Hybrid milk snake
0.1.0 rat snake
0.0.2 prairie ringneck snakes
0.1.0 chilean rose hair tarantula
1.1.0 emperor scorpions
1.1.0 Congo African Grey Parrots
0.1.0 German Shepherd hybrid dog