On the morning of Oct. 23, a 56-year-old employee at West Japan Railway Co. was inspecting trains when he encountered an Asian black bear just outside Tsuruga Station in Fukui Prefecture. He escaped with just a scratch, but about 10 minutes later the same bear fractured the leg of another worker at a nearby construction site.

Four days before the incident, a male bear entered a four-story shopping center in neighboring Ishikawa Prefecture. The 1.3-meter-tall bear holed up in a storage room for 13 hours, until it was shot by a local hunting group.

“We have received an unprecedented number of reports of bear sightings this year in Kaga,” said Yukio Yamagishi, a director at the city’s Agriculture, Forestry and Fisheries Division.

Between April and September this year, wild bears were spotted 13,670 times across Japan, the most over a six-month period in the last five years, data from the environment ministry showed. In many northern regions, the number of reported bear sightings reached the highest in over a decade.

There are multiple factors behind the increased number of bear sightings, according to Shinsuke Koike, an associate professor of ecology at the Tokyo University of Agriculture and Technology and deputy representative of the Japan Bear Network, which runs lectures and studies on promoting the co-existence of bears and humans.

Oak trees alternate each year between heavy and low production of acorns, a staple food for bears. This was a bad year for acorn yields, and the lack of food may have driven the bears closer to civilization. With the younger generation moving to the cities, aging residents are unable able to harvest crops or fruits grown in their gardens, which tempt starving wild animals.

The coronavirus outbreak may also have affected the bears’ behavior, Koike said. Japan declared a nationwide state of emergency from April to May, with many stores and factories shortening their operating hours and people strongly encouraged to stay home. “Bears might have expanded their areas of activities after not seeing humans around during spring and early summer season,” he said.

In some cases, the bears leave damaged property in their wake. Yuki Tasei grows expensive Shine Muscat grapes on his fruit farm in Takahata, Yamagata Prefecture. Bears ate up as much as 40 kilograms of his crop in October, causing ¥100,000 ($963) of damage. “It was (the) first time we had bear attacks,” he said.

Bears caused on average ¥426.7 million in crop damage per fiscal year from 1999 to 2018, according to government data. Around 572 hectares of forest were destroyed on average annually over the last five fiscal years, including when bears stripped the bark off trees as they foraged.

The transportation sector has also had run-ins with wildlife from the mountains. “Many wild animals jump in front of running trains every year,” said Shoriki Yamazaki, a spokesman for the Kanazawa branch of JR West. According to the rail company’s data, there were 224 cases of trains getting delayed for more than 10 minutes in the last six fiscal years due to collisions with wild animals in the Fukui Prefecture area.

Some local companies are now seeking solutions to keep bears away from residential areas. Hokkaido-based Ohta Seiki has a patent pending for its mechanical “Monster-Wolf,” which emits 90-decibel roars and moves its neck just like the bears’ predator. The company says about 70 “wolves” have been purchased by Japanese farmers in the last three years.

Koike, the professor, suggested a more benign tactic. “It’s important to draw a clear boundary between human and bear areas, by trimming the lawn or removing attractions for bears including unharvested fruits or food waste, so that bears can distinguish their home and won’t mistakenly enter where humans live,” he said.

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