When you purchase through links in our articles, we may earn a small commission. The Dutch Fish Doorbell mixes livestreams, crowdsourcing, and conservation in all of the best ways. Every spring in the Dutch city of Utrecht, thousands of fish attempt to migrate through the city's canals to reach spawning grounds, but locked flood gates stay shut for long stretches to manage water levels. So the city came up with a weirdly charming solution: a fish doorbell. The site, called Visdeurbel --or Fish Doorbell--lets anyone in the world help the fish out.

Many different fish species travel vast distances every year to reach their breeding grounds. Nowadays this journey is made more difficult due to obstacles such as water locks. One of these water locks placed along a popular route for migrating fish is the Weerdsluis in Utrecht. In order raise awareness, an initiative was launched together with the municipality of Utrecht: the Fish Doorbell. Here users could watch a livestream of the waters at the lock, and'ring' a bell if they spotted a fish.