How the Dutch Fish Doorbell helps migrating fish each spring

www.scientificamerican.com

How the Dutch Fish Doorbell helps migrating fish each spring

www.scientificamerican.com

paywallMB to Scientific AmericanEnglish · 26 days ago

Ding-dong! The Dutch Fish Doorbell needs you to help migrating fish

www.scientificamerican.com

A Dutch lock is closed for the spring, and its employees want you to tell them when migrating fish come knocking by ringing a digital doorbell

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