Sometimes, during breeding, the genes of a cub get a little messed up! What comes afterwards can be a wild card. Mutations randomly occur when breeding a lioness. Although lower fertility levels are more likely to produce a mutation naturally, they can be produced from a lioness of any fertility level. Even then, some mutations are more debilitating than others, while some mutations are more common. As a general rule, lethal mutations and hybrids tend to be quite rare.
Types of Mutations
Adult Mutations
Not all mutations are visible from birth. Adult Mutations are mutations that change the appearance of an adult lion, or affect them in some way during their adult life stage.
Hybrids
Hybrids? Say what?! That's right—your ladies aren't always as loyal as you think. 
They may sneak off to have a tryst with a male of another species, and you might find yourself with a leopon or tigon cub on your paws! For details about hybrid mutations, be sure to check out this page.
Lethal Mutations
With breeding comes great responsibility. Any breeding can cause a Lethal Mutation to occur, although the odds are incredibly low; however, you may want to prepare yourself in advance, so you know just what to do if your lioness happens to give birth to a lethally-mutated cub.
Patches and Piebalds
While Patches and Piebalds are technically considered to be visible mutations, there are just so many of them that they've earned their own page. If you want to see all existing patterns, check this page out!
Primals
Just like Patches and Piebalds, Primal mutations are visible straight from birth. There may not be as many variants for Primal as there are for Patches and Piebald, but there are so many intricacies when it comes to Primal breeding—you'll definitely want to give this page a read-through!
Visible Mutations
Unlike adult mutations, Visible Mutations are visible straight from the moment your cub came into this world.
Mutation Items
Breeding
It is highly recommended that you stack some of these items with a Buffalo Scrotum, as the chance of a mutation occurring rolls per cub.
* Potential bonus item when buying $100 worth of GB in one transaction during the Black Friday sale.
* Rare drop from a retired Tigon Hype encounter.
* Purchase from the Carrion Shop for 2000 SB.
* Purchase from The Boneyard for 100 LB.
* Rare drop from winning a battle against a January event NPC.
* Purchase from the Gorilla Enclave for 300 MT.
* Purchase as a Referral Reward for 10 RP.
* Jackpot Reward from Slots.
* Potential bonus item when buying $100 worth of GB in one transaction during the Black Friday sale.
* Potential bonus item when buying $100 worth of GB in one transaction during the Black Friday sale.
Mutie On Demand
There are several "Mutie On Demand" applicators that you can use on your lions in order to apply mutations directly onto them.
Removing Mutations
If, for any reason, you decide that you no longer want your lion to be mutated, there is an item that will remove their mutation.
Inheritance
Important Note: Most mutations are not naturally inherited. "Inherited" means to be genetically passed down from either parent. The only mutations that are naturally inherited on Lioden are as follows.
- Dorsal Fur. This mutation can be passed down from both males and females. Breeding two Dorsal Fur lions together doubles the chance of producing Dorsal Fur offspring.
- Leopons. This mutation can only be passed down from Leopon females. Leopon males cannot pass their mutation and can only breed to lionesses with Goddess fertility.
- Overgrown Fur. This mutation can only be passed down from Overgrown Fur females. Only female offspring can inherit this mutation.
- Patches. All Patches patterns can be passed down from both males and females. Breeding two Patches lions with the same pattern together doubles the chance of producing Patches offspring with that pattern. If two different patterns are bred together, there is an equal chance of offspring inheriting either pattern.
- Piebald. All Piebald patterns can be passed down from both males and females. Breeding two Piebald lions with the same pattern together doubles the chance of producing Piebald offspring with that pattern. If two different patterns are bred together, there is an equal chance of offspring inheriting either pattern.
- Primal. This mutation can only be passed down from Primal males (including variations) and Primal (Ferus) females. Male and female offspring can inherit this mutation.
- Primal (Felis). This mutation can only be passed down from Primal males (including variations) and Primal (Ferus) females. Male and female offspring can inherit this mutation.
- Primal (Ferus). This mutation can only be passed down from Primal (Ferus) males and females. Male and female offspring can inherit this mutation.
- Primal (Smilus). This mutation can only be passed down from Primal males (including variations) and Primal (Ferus) females. Only male offspring can inherit this mutation.
- Tigons. This mutation can only be passed down from Tigon females. Tigon males cannot pass their mutation and can only breed to lionesses with Goddess fertility.
All other mutations can only be passed down from a mutated lioness with the aid of a Lion Scrotum.
* Purchase from the Champion Shop for 400 MB.
* Potential bonus item when buying $100 worth of GB in one transaction during the Black Friday sale.
Mutation Roll Order
† Note: this is only specifically for lionesses with one of these mutations, as they are heritable. If the lioness is a Leopon, it will roll for her mutation's natural pass chance first, then move on to Patches/Piebald if she was bred with a Patches/Piebald stud, etc. The same goes for Overgrown Fur - it will roll for her mutation's natural pass chance first, then move on to Patches/Piebald if she was bred with a Patches/Piebald stud, etc. Finally, the same goes for Tigons. Patches/Piebald will only roll with their own natural pass chance if either the lioness or the stud has that mutation.
If the mother does not have a heritable mutation, the official mutation roll order will operate the same as listed above, just without the chance to inherit Leopon, Overgrown Fur, Tigon, Patches, or Piebald (assuming she was not bred to a Patches/Piebald stud).
To clarify, heritable mutations will only roll if one of the parents has the mutation, and it can pass down from that parent. If you do not breed a lion with a heritable mutation, they will not "roll" when your cubs are conceived and generated. If you do not use mutation-boosting items, they will not "roll" when your cubs are conceived and generated. The mutation roll order above is only assuming that a lioness has a heritable mutation, is bred to a Dorsal Fur, Patches, Piebald, or Primal stud, mutation items have been used on her, etc.
* Note: the Tigon boost cannot be claimed after November 30th, 2018, though some pride leaders may still have the boost applied as they have not bred since receiving it. Though the Tigon boost rolls third-to-last, it will overwrite all other mutations if it triggers. It is recommended that you do not use the Tigon boost on a lioness with a heritable mutation, as any potential Dorsal Fur, Leopon, Overgrown Fur, Patches, Piebald, Primal, or Tigon cubs that may have been produced will be overwritten by the Tigon boost's activation.
* Note: the Dorsal Fur guarantee can only be claimed each May, though some pride leaders may still have the guarantee applied as they have not bred since receiving it. Though the Dorsal Fur guarantee rolls last, it will overwrite all other mutations if it triggers, even a Mukombero if it was used on a lioness. It is recommended that you do not use the Dorsal Fur guarantee on a lioness with a heritable mutation, as any potential Leopon, Overgrown Fur, Patches, Piebald, Primal, or Tigon cubs that may have been produced will be overwritten by the Dorsal Fur guarantee's activation. You should also avoid using the Dorsal Fur guarantee on a lioness that has been given any mutation items (especially one as expensive as a Mukombero), as it will completely overwrite any mutated cubs and force them to have Dorsal Fur.
Customisation
Decors
Official site decors are not created to fit mutated lions. If an official decor happens to fit a mutated lion, it is purely coincidental and not intentional by the site artists. Keep in mind that equipping official decors onto mutated lions may result in some... interesting placings if the mutation has major lineart changes.
If you want to decorate your mutated lion, your best chance would be to look for custom decors for sale that were drawn specifically to suit a certain mutation.
Eventually, we plan on hosting a "Mutation Decor Compatibility" resource for all mutated lions with major lineart changes (ie. Dwarfism, Leopon, Primal, Tigon, etc.)! There is no current ETA as Lioden contains thousands of decors that need to be checked, but perhaps one day in the future... 
Oasis
If your leader has a mutation and you wish to customise them using the Custom Lion Oasis tool, don't fret—their mutation will remain even after customisation! A lion's appearance consists of their base, eyes, mane colour, mane shape, markings, and skin. Mutations are not tied to your lion's appearance data. When you use the Custom Lion tool, it doesn't wipe your leader's age, cubs bred, heritage, karma, or stats; it only directly affects your leader's appearance.
As a visual example, this is a king pre-customisation. He's a Primal (Ferus), but unfortunately is a little... lacking.
We decide to go spruce him up in the Custom Lion Oasis tool. Unfortunately, the tool does not display mutation lineart if you happen to have a mutated king—but, as previously stated, his mutation will remain, so let's go on and customise him!
Perfect. We decide this is what we want, so we hit "Customize!" and are then redirected to his page.
What a stunner! 
So, there you have it. The tool can safely be used on any pride leader with any mutation. It only works on leaders. You cannot target any other lion within your pride, so the only way to customise an existing lion that is not a pride leader is by using applicators.
Poses
Some mutations can be equipped with poses! Not every mutation is compatible, unfortunately, but the ones that are compatible are as follows.
- Achromia
- Blind
- Clawless
- Double Uterus
- Eyeless
- Melanism
- Overgrown Claws
- Overgrown Teeth
- Overgrown Tongue
- Patches (all patterns)
- Piebald (all patterns)
- Primal Fangs
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