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Have a Happy Thought: Dams on rivers have many benefits to humans (power generation, managing downstream flow, ensuring year-round drinking and farming water, etc). Unfortunately, dams have equal (or often greater) dis-benefits to creatures that live in and around those rivers. One major issue is allowing fish that use the length of the river for feeding and spawning, to actually travel the length of the river! The city of Utrecht, Netherlands, has addressed this issue by having a “ fish doorbell ”. When fish pass in front of a camera, the lock keeper can let the fish through. But to make sure the lock keeper doesn’t miss any fish… there is a website where you (and about 1,000 others at any given time, it seems) can watch the live feed, and press the fish doorbell on the fish’s behalf! Image: The Utrecht canal lock keeper opens the lock. About — The Fish Doorbell   Many other rivers, canals, etc have had fish passages installed, such as this one on the Waikato River in Ne...