> You can use them just about anywhere that collects water—bird baths, fish ponds, etc.–because BTi is totally non-toxic to other wildlife. The only caveat here is that you don't want to use mosquito dunks in water that'll be ingested or touched by humans, so avoid using it in pools.

It's totally safe! Except for two species: mosquitos and humans. Right. At least the label [1] doesn't make any claims about it being safe for wildlife. It just says it's not safe for humans (and mosquitos.)

[1] https://www.domyown.com/images/323-2.jpg