Arthur Conan Doyle writes:

Dan Espen wrote:

Step 3 is not necessary and may be illegal. Not to mention the danger
to those cute little chipmunks, birds, children's fingers.

This will be news to the major commercial pest control companies. I take it you
haven't seen what they are using these days? They are quite legal. The bait
station boxes are specifically designed to allow access to rodents, but not to
the other animals you cited. They are locked to prevent child access.

https://www.amazon.com/Protecta-LP-R.../dp/B003OS18HE

Reducing the population pressure outside is the preferred strategy for dealing
with rodent infestations.

One review says it killed squirrels.
Another points out that the mice eat the bait and go somewhere else to
die. Any animal eating that dead mouse is likely to die too.
So, it can potentially kill cats, hawks, snakes.

Killing outside mice is pointless if you've sealed all their entrances.
Your likely to poison an outside mouse, have it crawl into your house
and then have it die in the walls.

--
Dan Espen