Question

an ecosystem that had mice . what happens if more cats were added to it?

Answer 1

Mice population must be significantly decrease and especially when cats were at the top if the respective food chain.

Here the apex predator was nothing remains them in check and also feral cased major damages to the bird and other small mammal population in the part of the Australia.

Additionally, it has impact of adding more predator than ecosystem which hand handle due to increase of cat and other irresponsible breeders.