A crow-repellent device deployed in Tokyo has been declared a success after scaring off the pests with recordings of their own calls.
While other cities have problems with pigeons or seagulls, the Japanese capital has long struggled with crows that feast on discarded food waste at recycling sites. In the northern suburbof Adachi, home to nearly 700,000 people, the local authorities have adopted a new tactic of having loudspeakers play recordings designed to warn off the birds in their own language.
The Crow Controller — which consists of an infrared sensor and a loudspeaker that emits ten-second bursts of angry caws, the equivalent of an aggressive “get out of here!” — was developed by CrowLab, a company spun off from Utsunomiya University in 2017. The
