Dr. Adrian Walton, the head veterinarian at Dewdney Animal Hospital, encountered a rare incident dubbed as the “oyster attack” in his veterinary career. A Pacific great blue heron was brought to him with its toe ensnared in an 18-centimeter oyster, posing a severe threat to the bird’s life.
This unique situation, involving an oyster clinging onto a heron, was a first for Dr. Walton. The rescue operation unfolded after a biologist from the Vancouver Aquarium’s Marine Mammal Rescue Society spotted the distressed heron struggling in False Creek. The heron was at risk of drowning or becoming prey to other animals if not rescued promptly.
Prompt action was taken as the biologist alerted the B.C. Wildlife Response Team, who swiftly dispatched a team of experienced rescuers. They found the heron trapped by a remarkably large oyster, which weighed over 300 grams, a significant fraction of the bird’s weight, hindering its movement and flight capabilities.
The challenge was to remove the stubborn shellfish without causing harm to the bird or aggravating the oyster. Dr. Walton, drawing on his expertise in fish farming, administered an anesthetic to the oyster to safely pry it open and release the heron’s foot from its grasp.
Despite sustaining ligament injuries, the heron is expected to recover after undergoing a toe amputation and receiving necessary medical care at the B.C. Wildlife Association’s Burnaby Lake facility. The successful rescue of this heron holds significance, especially during the fledging season, as blue herons are considered a vulnerable species in British Columbia.
As for the oyster, although unfit for consumption, the rescuers plan to preserve its shell as a keepsake of the remarkable rescue mission.