Thanks Rowan. I had in mind some sort of fearsome beast with a yellow fuzzy nose.
Yes there are several studies on secondary poisoning. You do indeed need to be careful. Owls do prefer live food but many other birds don't care. Living with Snakes is a natural way of coping with mice -- outside. Poor Snakes get a bad press that's completely unjustified. (Mouse plagues can require different measures, unfortunatly.)
Huntsman Spiders do a good job of eating insects in our home and also Bats -- that live between the ceiling space and the roof. They often do a fly-around in the house before going outside. We have Ewings Tree Frogs living with us too. Speaking of soap -- it kills frogs -- clogs up their skin. You need to be careful with that too.
I met Leopard Slugs a while back. Huge attractive creatures. We found them eating scaps of apple on the kitchen bench. Being slugs they're a bit dim. I hand fed them with cheese. They waved their horns at my fingers. Amazing moment.
Isn't it great the things we share here.
Cheers, Joy