Dnd/ high fantasy concept that's been itching my brain; tamed mimics vs wild mimics.
In the wild female mimics tend to be the dominant gender because during the laying season (they lay eggs like fish in my head but store them in their chest) they get extremely aggressive and will sometimes kill males trying to fertilize their eggs, mistaking them for a predator or even just because they're unimpressed with the male. The eggs are shaped like golden coins, jewels, all that stuff they're known for, and people just assumed that it was bait until they found out the truth of their existence.
Tamed mimics are females spayed at a young age, this makes them less violent, and in high class society are used as an on the go jewelry box or some sort of emergency kit. Spaying them at such a young age stunts their growth though, so for working mimics they're captured from the wild at a grown age, get spayed, and gradually tamed until they can be used to move equipment. This is phasing out of practice because it's unethical and there are better ways to transport things now (plus they occasionally steal something that catches their eye).
A sort of mix between them is a mimic raised by people but not spayed, they're used as safes once trust is gained. You would expect this to be faulty, but they understand that what their master has given them is valuable and protect it as a wild female would with her eggs.
Mimic eggs are treated as even more expensive calamari, and are typically harvested in the wild due to the fact it would be a lawsuit waiting to happen in a warehouse full of mimics. If somebody were to accidentally snatch fertilized eggs they're typically sold off to the rich people mentioned at the top of the post.
