* Arthropods: Many insects and other arthropods have multiple legs, but they come in pairs. This means they'd have an even number of legs like 6, 8, 10, etc.
* Vertebrates: Animals with backbones like mammals, reptiles, birds, and fish have four legs or two legs (in the case of birds).
So, if you encounter a creature with twelve legs, it's likely a fictional creature or an anomaly in nature!