Imagine my surprise.
I’m watching the Rock Pigeons up in the steel that’s holding up Sprague Bridge.
I notice Northern Rough-winged Swallows and Barn Swallows making crazy-fast passes under the bridge.
I’m standing there in waders, hoping to catch these aerial acrobats in the morning light.
Not a chance.
And that’s when the irony hit me.
Tunnel vision.
With a field of vision restricted by the bridge opening and an 800mm lens, the likelihood of success was slim to none.
But then a funny thing happened.
I noticed some of the swallows slowing down… then simply disappearing.
Sometimes you have to forget the viewfinder and just look at the situation naturally.
I did.
Mystery solved.
The weep holes in the bridge foundation wall were portals to nests!
That’s why I kept seeing birds gathering in the tree just above the bridge opening. They weren’t just resting.
They were commuting.
Those little concrete drainpipes that engineers installed to relieve water pressure behind the bridge wall had been repurposed by Mother Nature into waterfront condominiums.
River views.
Excellent ventilation.
Unlimited flying insects.
No property taxes.
It turns out this isn’t unusual at all.
Northern Rough-winged Swallows have been nesting in holes for thousands of years. Before bridges, they excavated or borrowed burrows in sandy riverbanks and eroded stream edges. Modern bridges simply provide a ready-made substitute. To a swallow, a weep hole isn’t concrete.
It’s home.
Once I understood that, everything changed.
Instead of chasing impossible flight photographs, I waited.
An adult appeared.
Paused for the briefest instant.
Then vanished into the darkness.
Seconds later another face appeared from inside the tunnel, as if checking whether the coast was clear before launching into another day of insect patrol over the Narrow River.
What amazed me most wasn’t the engineering.
It was the partnership.
Human engineers designed those pipes to protect a bridge from water damage.
The swallows saw something entirely different.
Safety.
Shelter.
A nursery.
It’s another reminder that nature doesn’t care what we intended.
It simply asks one question:
“Can I make a life here?”
Apparently…
The answer at Sprague Bridge is a resounding yes.
Naturally.
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