A significant number of owls migrating through northern British Columbia has kept researchers at the Mugaha Marsh Banding Station busier than usual. The influx of birds this year, surpassing the numbers seen in recent years, has led to record-breaking owl captures, with 266 owls caught so far this season.
Jeannine Randall, a bird biologist at the Mackenzie Nature Observatory, mentioned that they typically catch around 100 owls during a season, but this year’s numbers have exceeded expectations. The surge in owl populations has caused a shortage of the specialized tracking bands needed to monitor the birds, especially the larger-sized bands required for saw-whet owls.
Despite reaching out to various organizations for assistance, the station discovered that the owl boom was not unique to their location, as other stations also faced band shortages due to the widespread phenomenon. The high numbers of owls captured are believed to be linked to an abundance of small rodents, the primary prey of these birds.
While the owl population surge at Mackenzie is positive, it may not reflect the overall trend for owl species in the province. Rémi Torrenta, a biologist with Birds Canada, highlighted that many owl populations have been declining over the past 25 years. Despite some stable or increasing populations, such as barred owls, most species, including northern saw-whet owls, have experienced declines.
Torrenta explained that the spike in owl numbers this year is likely part of a recurring four-year cycle. This cycle involves a rise in owl populations followed by a subsequent crash in rodent populations, forcing owls to migrate south in search of food. 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 crucial role in monitoring owl populations and migration routes, providing essential data for scientific research. Recently, the station recaptured an owl that had been banded in Victoria in 2024, shedding light on the species’ travel patterns and emphasizing the importance of ongoing research efforts.
