A significant number of migrating owls are currently passing through northern B.C., creating a busy period for researchers at the Mugaha Marsh Banding Station. This influx, which is unprecedented in recent years, has exceeded expectations, with a record-breaking 266 owls captured so far, surpassing the typical count of 100 during this season. Due to the unexpected surge, there has been a scarcity of the required tracking bands, particularly the larger size needed for saw-whet owls, the primary species of interest.
Despite seeking assistance from other organizations, the station found that the owl upsurge was not unique to their location, as other facilities were also grappling with band shortages. Jeannine Randall, a bird biologist at the Mackenzie Nature Observatory, attributes the surge in owl numbers to the abundance of small rodents, such as mice, deer mice, and voles, which form the main prey for these birds.
While the spike in owl populations at Mackenzie is positive news, Rémi Torrenta, a biologist with Birds Canada, warns that many owl species in the province have been experiencing declines over the past 25 years. Although some species like barred owls have remained stable or even increased, the majority, including the northern saw-whet owls, have been on a downward trend.
Torrenta explains that the current high owl volume is likely part of a well-documented cycle, where an abundance of owls leads to a crash in the rodent population the following year, forcing the owls to migrate south in search of food. This phenomenon, known as a mass eruption, is a natural occurrence. To monitor these trends, Birds Canada coordinates the Nocturnal Owl Survey, a citizen science program that relies on volunteers nationwide to track owl populations each spring.
The banding project at the Mackenzie Nature Observatory plays a crucial role in contributing data to understand owl populations and migration patterns. Recently, a recaptured owl originally banded in Victoria in 2024 shed light on the species’ travel behaviors, emphasizing the importance of ongoing research and data collection for effective species management and conservation decisions.
