Introducing non-indigenous creatures during travel?

So, I've been gone for a while, but I just thought I'd show my face here again to say hi and leave in a matter of days.  But, I'd like to question the practice of your species bringing other plants and animals across countries like pests, pets, and livestock and they escape and start changing the planet's cycle.  Just as humans introduce critters like rats, hogs, snakeheads, pythons, cats, cane toads, pigeons and so much more that've disturbed the natural ecosystem.  Possibly making a mass extinction on a continent.  Just a thing I thought.