Its 5 months old, Nefei, not 6! At 6 they stop showing Cub Young lineart, but they can be traded starting at 5 months old.

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When cubs reach 6 months of age, they stop nursing and will be 'separated' from their mother. From then on, you can sell them without also selling the mother.

Both are different playstyles so have different groups of players preferring one or the other. Stats need to be seriously high to be valuable and most bases that aren't special, don't sell for all that much. It depends on what you want to put effort into.

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Oof, I shouldn't be answering questions half asleep, I start confusing things

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I've heard that some players like stats well into 200 or more. I've started breeding a few with high stats and I have 1 male although he's no longer a cub.

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Just stats alone will not likely to sell; most people are looking for special traits, bases, markings, skins, eyes, etc. The more special traits cub has, the better. Stats just add to the list but they alone arent enough to make cubs sell well.

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Such as rare and uncommon bases?

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Yes, Rare and Special bases are most wanted, as well as breed-only markings, Tier 2 and some from other tiers, they're explained on wiki!

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Is there a place I can check the markings to see if they are on tier 2 and that stuff?

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https://www.lioden.com/topic.php?id=304429531210

Wiki explains what each tier is, and, the markings tier is listed on a lion/wardrobe next to marking!

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