Thousands of birds were filmed swirling like a cyclone around a church steeple, sparking fears that the ominous spectacle was a sign of impending doom.
Footage captured around 4,000 Vaux’s swifts forming a massive, dark cloud above a church in Salem, Oregon, before suddenly plunging into its chimney to roost for the night.
‘I recognize the end of the days when I see it,’ one person wrote on Reddit.
Another warned: ‘I’ve watched enough movies to know the protagonists have to get in there immediately or we’re all doomed.’
Vaux’s swifts are tiny, cigar-shaped birds measuring no more than five inches long and weighing just over half an ounce.
They sleep inside chimneys using their specialized sharp toes to cling vertically to rough, unlined brick-and-mortar walls.
Although the eerie swarm unsettled some viewers, large flocks of Vaux’s swifts are commonly seen in Oregon during their late-summer migration.
One Reddit user offered a less apocalyptic explanation, writing: ‘Phenomenon happens every September in Oregon.’
Thousands of birds were filmed swirling like a cyclone around a church steeple, sparking fears that the ominous spectacle was a sign of impending doom
Vaux’s swifts migrate to Oregon twice a year, arriving in late April for the breeding season and passing through in large groups during their fall southward migration from late August through early October, with September being the peak month
The nightly ritual was captured on September 6 by local David P Craig, who shared footage on his Instagram.
‘A swift’nado is spinning at Salem First United Methodist Church, and scores of neighbors, families, and students have gathered shoulder to shoulder at dusk, phones down, necks craned, watching 4,000+ Vaux’s Swifts pour into a brick chimney like smoke running in reverse,’ he wrote in the video caption.
Craig, who is a professor at Willamette University in Oregon, explained that his students were counting the birds and teaching visitors why the chimney is so important to their survival.
He added that Vaux’s swifts evolved to sleep inside enormous hollow old-growth trees, but as those trees disappeared, a dwindling number of old, unlined chimneys became essential substitute roosts.
Groups of roosting swifts can range in size from just a few individuals to as many as 35,000 in some larger smokestacks.
The chimneys these birds will use are pretty specific: bricks, especially if they are in multiple layers, are good at regulating temperature, and they must have exposed mortar joints to cling to.
Because the birds feed exclusively on insects caught in flight, a gathering of this size can also reveal the health of the local insect population.
‘I recognize the end of the days when I see it,’ one person wrote on Reddit. Another warned: ‘I’ve watched enough movies to know the protagonists have to get in there immediately or we’re all doomed’
Footage captured around 4,000 Vaux’s swifts forming a massive, dark cloud above a church in Salem, Oregon, before suddenly plunging into its chimney to roost for the night
Protecting the swifts therefore means preserving both their chimneys and their food supply.
A similar event unfolded in Portland this month, where video captured a massive flock of Vaux’s swifts circling, and then pouring into, another church chimney.
For more than 40 years, one of Oregon’s strangest wildlife spectacles unfolded in the heart of Portland every September.
Thousands of Vaux’s swifts would form a funnel-shaped cloud above Chapman Elementary School before pouring into its old chimney to spend the night.
At the phenomenon’s peak, as many as 15,000 birds crowded inside the chimney, clinging to its walls for warmth before emerging at dawn to hunt flying insects.
But in 2024, the swifts abruptly abandoned the famous roost – and have not returned.
Experts say the birds have not disappeared, however. They appear to have dispersed among other chimneys across the Portland metropolitan area, including locations in Oregon City.
