A significant number of migrating owls have been keeping researchers at the Mugaha Marsh Banding Station busy in northern British Columbia with a remarkable influx not seen in years.

Jeannine Randall, a bird biologist at the Mackenzie Nature Observatory, located around 200 kilometers north of Prince George, expressed enthusiasm for the extraordinary owl activity this year. Normally capturing around 100 owls, they have already caught 266 with two weeks remaining in the season, marking a record-breaking year.

The surge in owl numbers posed a unique challenge as there was a shortage of the official tracking bands required for monitoring the birds, particularly the larger size bands needed for saw-whet owls, the primary species targeted at the station.

As the station sought assistance from other organizations due to the band shortage, it became evident that the spike in owl populations was not exclusive to their location, with numerous stations facing similar band shortages.

Randall attributed the increase in owl numbers to the abundance of small rodents this year, with most of the captured owls being young birds that rely on rodents like mice, deer mice, and voles for food.

While the high owl numbers at the Mackenzie station are encouraging, Rémi Torrenta, a biologist with Birds Canada, cautioned that many owl populations in the province have been declining over the past 25 years, including the northern saw-whet owls.

Torrenta explained that the current owl abundance is likely part of a documented four-year cycle where an excess of owls leads to a crash in the rodent population the following year, forcing owls to migrate south in search of food, known as a mass eruption.

To monitor these trends, Birds Canada coordinates the Nocturnal Owl Survey, a citizen science program that relies on volunteers nationwide to track owl numbers each spring.

The banding project at the Mackenzie Nature Observatory plays a vital role in collecting data for monitoring owl populations and migration patterns, contributing to broader scientific research efforts.

A recent discovery at the station involved recapturing an owl banded in Victoria in 2024, offering valuable insights into the species’ travel behaviors and emphasizing the importance of ongoing research for effective species management.

Overall, the owl migration phenomenon highlights the need for continued monitoring and research to understand and protect these fascinating birds.