Asian black bears appeared across Japan throughout early and mid-April, with reports of massive individuals entering residential areas [1, 2].

These sightings are particularly concerning because they precede Golden Week, one of Japan's busiest travel periods. The increased frequency of bears entering human settlements poses a direct risk to residents and tourists, especially as animals show a growing obsession with human-provided food sources [3, 4].

Reports indicate that some bears have reached weights exceeding 300 kg [2]. This size is considered unusual for the spring season, surprising local hunters and wildlife experts [2]. The sightings have been widespread across the country, with a high concentration of reports coming from Hokkaido and the Tohoku region [5, 6].

Experts said the surge is driven by two primary factors: climate change and behavioral learning. Warmer temperatures have caused bears to wake from hibernation earlier than usual [3, 4]. Simultaneously, bears have learned to associate human neighborhoods with easy access to food and garbage [3, 4].

Data suggests that the frequency of human-bear conflicts is rising sharply. Some reports indicate that the number of human casualties has increased by two to three times compared to 2023 [2]. Additionally, researchers have documented over 3,000 encounters with bears, nine of which resulted in attacks [7].

This trend follows a record-breaking year in 2025, which saw the highest number of bear sightings in history [6]. Local authorities continue to warn residents to secure waste and remain vigilant as the spring season progresses.

“Bears have reached weights exceeding 300 kg.”

The intersection of premature hibernation wake-ups and the 'habituation' of bears to human food creates a dangerous cycle. As bears lose their natural fear of humans and associate residential areas with high-calorie rewards, the likelihood of aggressive encounters increases. This shift suggests that traditional wildlife management may be insufficient against the combined pressures of climate change and urban encroachment.