Inverted: The wildlife are all dull grey or brown, even ones that normally wouldn't be, like peacocks or poison dart frogs.
Subverted: We see what appears to be a bright red wolf, but it's actually fleeing from a gruesome fight- underneath the blood, it's a perfectly normal grey.
Double Subverted: A brightly colored animal is seen, but it's actually covered with some sort of bright substance that's making it look like that. Then, said substance is removed and the animal is just as bright underneath.
Parodied: At several points in the series, people wearing hideously bright fur coats are seen- this is mentioned as the issue with there being no normal-colored wildlife.
Zig Zagged: The Double Subverted Wolf has been painted a bunch of times. Each time it looks like he's really that color, but then it gets washed off.
Averted: The animals have perfectly ordinary colors.
The producers want to convey that the show is set on a different planet, but don't want the animals to be too radically different for the audiences to be alienated.
Lampshaded: "Oh, look, another highlighter-yellow panda. Just another normal day..."
Invoked: A scientist genetically engineers brightly-colored animals in the hopes of making the world's wildlife more interesting to watch.
Exploited: Hunters certainly don't have any problem tracking prey in this world
Defied: All odd color mutations of animals are hunted down at once for fear of them becoming commonplace and simply looking bizarre.
Discussed: "All right, so we've just arrived on the new planet. We have to watch out, in case there's hostile wildlife." "Will they be brightly-colored animals? I always wanted to find one of those!"
Conversed: "Why is that cow green? This episode made perfect sense, and then... green cow. Could they at least explain this bizarre wildlife?"
Most animals are almost extinct, having been hunted easily by predators and by humans with their lack of camouflage, and the world's ecosystem is beginning to fall apart. In addition, the bright colors are caused by some sort of toxic radiation in the first place, and the remaining animals are beginning to get sick and die from the long-term exposure.