For a female rabbit to get pregnant, she needs to be physically mated with a male rabbit. While they can smell each other through the cages and may even interact through the bars, this is not enough for fertilization to occur.
However, it's crucial to note:
* Even with separate cages, male rabbits can still spray urine to mark their territory. This can create a strong scent that can attract females.
* If the cages are close enough, the male might be able to reach through the bars to mate with the female.
Therefore, even with separate cages, it's crucial to keep male and female rabbits apart unless you're intentionally breeding them.