A significant number of migrating owls passing through northern British Columbia has resulted in a busy season for researchers at the Mugaha Marsh Banding Station. Jeannine Randall, a bird biologist at the Mackenzie Nature Observatory, located about 200 kilometers north of Prince George, expressed excitement at the unprecedented owl numbers. Typically capturing around 100 owls, this season has seen 266 owls banded so far, with two weeks remaining, marking a record-breaking year.
The surge in owl populations presented a unique challenge as there was a shortage of the required tracking bands, particularly the larger sizes needed for saw-whet owls, the primary species targeted for monitoring. This scarcity was attributed to back-ordered bands from the bird banding office. Despite reaching out to other organizations for assistance, many stations faced similar shortages due to the widespread owl boom.
Randall suggested that the spike in owl numbers may be linked to an abundance of small rodents, which serve as the primary prey for these birds. While the high numbers observed at Mackenzie are encouraging, Rémi Torrenta, a biologist with Birds Canada, cautioned that overall owl populations in the province have been declining over the past 25 years. Some species are stable or increasing, like barred owls, while many, including northern saw-whet owls, have experienced decreases.
Torrenta explained that the current owl influx is part of a well-documented cyclic pattern, where high owl populations lead to a subsequent crash in the rodent population the following year. This phenomenon, known as a mass eruption, forces owls to migrate farther south in search of food. To monitor these trends, Birds Canada manages the Nocturnal Owl Survey, a citizen science program engaging volunteers nationwide to track owl numbers each spring.
The banding project at the Mackenzie Nature Observatory plays a crucial role in broader scientific research by providing essential data for monitoring owl populations and migration routes. Recapturing an owl originally banded in Victoria in 2024 offered valuable insights into the species’ travel patterns. Randall emphasized the importance of such research for making informed management decisions and enhancing species understanding.
