Why is the artificial relocation of rabbits to a new ecosystem leading to a sharp increase in their number?

Rabbits, like most members of the hare family, reproduce very quickly, and are also very hardy to different climatic conditions and quickly adapt to new food. Their numbers in their natural environment are controlled by various predators such as wolves, foxes and birds of prey. Getting into a new ecosystem, where there are no predators accustomed to hunting rabbits, these small animals begin to multiply rapidly. In history, this happened in Australia, where artificially introduced rabbits are now found all over the continent.