"susannah" wrote in message news:h2WL9.375

birds would be harmed, I beg to differ. IF the blackbirds die somewhere
other than your property, perhaps a bird of prey or
carnivourous/omnivorous
creature might ingest said dead blackbird.... If enough poisoned animals
are
ingested then the level of poison builds and can kill the consumer.

Apart from my brother-in-law and a family of foxes, I don't know of any
other meat eating animals in my area!