A viral video of common myna birds appearing to calmly ride a Sydney train in place of winged flight has shocked social media users. But not experts, who say it makes perfect sense that avian life has adapted to routinely navigate public transport.

Bird life is ubiquitous in Australia’s urban landscapes. They appear in our shopping centres, our workplaces, our homes. To witness a feathered friend on a train isn’t exceptional.

But ABC producer Jackie Dent was surprised to hear, when encountering a pair of myna birds on Sydney’s inner-city North Shore line last month, that they were apparently regular commuters. The duo were casually perched atop a seat together, well behaved and unmoving.

Dent hopped on at Roseville station and observed the birds “very relaxed and at home”.

“I got off at Chatswood to change trains and spoke to a lovely train guard to raise the alert that two birds were stuck on the train,” she wrote on social media alongside a video of the duo.

To her surprise, the guard responded that they “always” caught the train, jumping on and off between Lindfield and Artarmon – supposedly to scrounge for food.

Her post quickly went viral and the comment section blew up, with others sharing stories of birds they’d witnessed exhibiting the same behaviour.

“I’d always watch them when I caught the train to Lindfield in my uni days! They know exactly where they are going,” one user wrote of myna birds.

Sean Dooley, a senior advisor at BirdLife Australia, said it was “unusual” for birds to fly on to trains but not “unexpected”.

“The common myna is a highly intelligent bird,” he said. “It does seem very likely that it is the same birds riding the same train … to take advantage of food resources along the line.”

Common mynas are monogamous and territorial, so the duo are likely a couple. But Dooley said the habit could also spread to other mynas, as they share behaviour.

“They’ve learned to exploit all sorts of food resources from us, and they’re particularly good at feeding on the waste that we have, whether it’s in bins or stuff that’s strewn around,” he said. “Clearly they’ve worked out that there’s a veritable smorgasbord along the Northern line.”

Andrea Griffin, an associate professor in wildlife conservation at the University of Newcastle, said the video “doesn’t surprise me at all” as mynas are “incredibly accustomed” to living around humans, dating back to ancient Egypt.

They’re also “incredibly good learners” – mynas can mimic speech if kept by humans, have good memories and know how to navigate home from large distances.

“I would say it’s the same birds [getting on and off the train],” she said. “I suspect that a few birds have learned to do this. Mynas are quite loyal to their foraging areas so those birds would predictably be on that platform every day around the same time.”

As to what prompted them to make the leap on to an approaching train, Griffin echoed Dooley’s suspicion that it was food-driven.

“They’re not trying to go somewhere,” she said. “They’re not going out for a joyride.

“All you need, basically, is to have a bird where the door opens and there’s some food at the entry and they hop on. And then they learn, ‘oh, this is quite a good foraging ground. I might do this’.”