Thank you for sharing! I live a few blocks away from the town's main river. Our town will spray problem areas if people request, but I really don't going that route unless they get really bad. I've heard about these before, but never really looked at it much. It look like mosquito dunks are safe to use around chickens, and it is even safe to use in their water bowls! I dump and rinse their water daily, but it is good to know this won't bother them if they happen to get into some water that contains the dunk.