However, ferrets have been known to attack pet birds, so it is advisable for owners of both to take appropriate precautions to prevent these encounters. Ferrets are naturally inquisitive and can squeeze through very small spaces. Thoroughly check every room it will inhabit, sealing all holes and openings wider that 1 inch in diameter. Make sure that all windows that may be opened have secure screens. Check the openings around plumbing, heating, and air conditioning ducts or pipes.
Some kits are small enough to squeeze under some doors.
Ferrets are so small and silent that you will usually not hear them approach. They are easily stepped on when they are sleeping under a throw rug or suddenly turn up under foot. Their love of tunneling and their inherent curiosity frequently places them in potentially dangerous situations. They could very easily crawl unnoticed into your refrigerator, into the bottom broiler of a stove, through the rungs of a balcony railing, out the front door, or even end up in the washing machine with clothes under which the ferret was sleeping. Other dangers include folding sofa beds and reclining chairs.