If I interpret this correctly, the fish don't hit the doorbell -- human bystanders see fish and use their mobile devices to hit the doorbell. There's probably

If I interpret this correctly, the fish don't hit the doorbell -- human bystanders see fish and use their mobile devices to hit the doorbell. There's probably a solution that could detect the fish without human intervention, but it seems like one of the points is to help the citizens engage more an build awareness of the human/wild-life interaction.