On the wire

The Barn Owl Hit By A Car On Route 9 Flew Out Of A Box Last Night

Six weeks, one fractured coracoid, and a release protocol that hinges on a single question: can she fly silently?

TB
Theo BrandtWildlife Correspondent
July 27, 20265 min read
The Barn Owl Hit By A Car On Route 9 Flew Out Of A Box Last Night

She was found on the gravel shoulder of Route 9 in early June, upright but unable to lift her left wing, about forty metres from a hay field. A driver who had passed her twice turned around, threw a jacket over her — the correct improvised handling for a raptor, because darkness and pressure reduce struggling and protect you from the feet — and drove her to the Ellery Raptor Center in a cardboard box.

Vehicle strikes are the leading cause of admission for barn owls in most regions where anyone has counted, and the reason is a design conflict. Barn owls hunt low, slowly, and quietly over open ground, and roadside verges are excellent rough grassland full of voles. A hunting owl at two metres over a mown verge intersects with traffic at a bad angle and often doesn't register a car as a threat until it's inside the stopping distance.

Radiographs found a fractured coracoid — one of the strut bones bracing the shoulder — with no displacement, plus soft tissue trauma and a mild concussion. It was, in the words of the centre's veterinarian, Dr. Ngozi Aldridge, "the good version of the bad injury." A displaced coracoid fracture, or any fracture involving a joint, would likely have ended in euthanasia, because a raptor that cannot fly perfectly cannot be released and a wild adult barn owl typically does not tolerate life in captivity well.

Treatment was mostly restraint: a figure-of-eight wrap for nine days to immobilise the wing, cage rest in a dark quiet enclosure, anti-inflammatories, and fluids. Coracoid fractures in birds heal well with immobilisation and heal badly with movement, so the difficult part is keeping a wild owl still without letting her muscles waste.

Then came the part that takes longer than the healing: reconditioning. At three weeks the wrap came off and she moved into a fifteen-metre flight enclosure. Staff flew her twice daily, gradually increasing distance, and scored each session on three criteria — height maintained, number of passes without landing, and the one that matters most for this species, whether her flight was silent.

"A barn owl's whole hunting strategy is acoustic," Aldridge said. "She listens for a vole under grass, and she has to be silent enough to hear it over her own wingbeats. The comb-like fringe on the leading edge of the flight feathers and the velvety upper surface are what make that possible. If she'd broken or bent primaries in the strike, she'd have to wait to moult them out before release, no matter how well the bone healed. We can't send out an owl who can fly but can't hunt."

Her feathers came through intact. By week five she was flying twelve consecutive laps of the enclosure without landing, taking dead prey on the wing, and — assessed by two staff standing at the far end with the doors shut — producing no audible sound in level flight.

She was released at 9:15 on Tuesday night, in the same hay field, roughly four hundred metres back from the road. The box was opened facing away from the verge. She went out low, banked once over the standing hay, and was gone inside about six seconds.

The centre's ask of drivers is narrow and seasonal: slow down at dusk on roads that run alongside rough grassland, particularly between May and September when adults are provisioning young. And if you hit an owl, or find one on a verge, stop. "They sit very still and they look fine," Aldridge said. "About a third of the ones we admit had been seen by several people first."

TB

Theo Brandt

Wildlife Correspondent

End of article

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