A Melbourne locum nurse has returned from a series of interstate contracts with an unsettling piece of intelligence regarding the Australian white ibis, colloquially known as the bin chicken, a bird she had, until recently, assumed to be flightless.

MELBOURNE — "I always thought they just sort of walked everywhere," she said, recalling her time working contracts in Rockhampton and Western Australia — Rockhampton itself already a disorienting proposition for a Melburnian, all cowboys and conservative politics, humid heat, and small lizards on the walls where a Huntsman spider ought to be.

The alternative, it turned out, was nesting several metres up in tree canopies, and on more than one occasion, flying — a discovery she describes as "genuinely disorienting," on par with learning a pigeon could drive.

"In Melbourne they're just a fact of the footpath," she said. "They're on the bins, they're at the tram stop, they're inspecting your lunch from a distance of about thirty centimetres. There's no verticality to it whatsoever."

She initially developed a theory to explain the discrepancy, reasoning that Melbourne's persistently grey, low-hanging sky had, over time, convinced the local ibis population that flight was neither available nor worth the effort. "I thought, well, of course they don't fly here. Look at the ceiling. I don't really want to fly in this either."

The theory held for several months, until she returned to Melbourne and, standing outside her apartment, watched an ibis pass overhead at what she estimated to be twenty storeys.

"I just stood there," she said. "I didn't say anything. I don't think anyone else even looked up."

An Australian white ibis in flight with its wings fully outstretched against an overcast grey sky, above the roofline of a red-brick apartment block, a power line and a bare tree
An Australian white ibis in level flight above an inner-suburban rooftop. The species has been capable of this throughout.

She has since revised her position twice, is no longer confident in either the flightless theory or the weather theory, and has not ruled out the possibility that she briefly relocated to a parallel dimension in which the Melbourne ibis has been capable of flight the entire time, and simply chooses, more often than not, not to bother.

"I don't know what to believe anymore," she said. "I just know it wasn't doing that before."