While I was talking with someone I came up with the idea that you could make different types of nests for your lionesses. You could have your basic nest, which can be made of anything and just make sure of a safe birth, and you could have other, more complicated nests that give different bonuses to the cubs like a head start in training or a few extra stats.

Different items could be required for the type of nest you want to make, and depending on the 'quality' of the nest the rarity of the items would differ (rare items for a luxury nest, common for a basic).

For the auto-nesting feature you could 'set' the type of nest you want to create and receive a notification if you don't have the items needed, and you can change the type of nest you want to make at any time (but won't change nests already made).

It would be an entirely optional thing, seeing as the basic nest would just be the nests the lionesses already make, but could give an opportunity for people who breed for stats to get a small head start.