A faint scratching sound can indicate an animal using an attic.
And a handful of woodpecker holes can lead to hundreds of pounds of acorns hidden behind a wall.
That doesn't mean every minor sign should cause alarm.
But recurring or unexplained changes deserve attention.
In Castro's case, investigating those holes revealed something nobody could have guessed simply by looking at the exterior.
The dramatic moment wasn't when the woodpecker made the first hole.
It was when the wall was finally opened and the hidden consequences of all those repeated visits came pouring out.
One Woodpecker and an Unbelievable Hidden Pantry
For a pest-control professional with more than two decades of experience, memorable jobs are probably inevitable.
But this one was difficult to forget.
What began as a call about woodpecker damage turned into the discovery of an enormous hidden stash.
The bird had repeatedly placed acorns into openings in a California home's exterior. Instead of remaining near those openings, many of the nuts fell into the wall cavities, where they continued accumulating.
Eventually, Castro opened the wall.
And the acorns poured out.
The collection reportedly extended through large sections of the cavities toward the attic. By the end of the cleanup, approximately 700 pounds of acorns had been removed—enough to fill roughly eight large trash bags.
Yet perhaps the best part of the story is how the situation ended.
There was no need to treat the woodpecker as an enemy.
The bird had simply followed its instincts and happened to choose an extraordinarily inconvenient location.
The acorns were removed.
The holes were patched.
New siding was planned to make the house less accessible.
And the woodpecker was left unharmed, hopefully to find a better—and far more practical—place to store its future meals.
The homeowner was left with a repaired house and one of those stories that sounds almost impossible until you see the evidence.
Castro, despite more than 20 years of experience, was left with a new entry on his list of things he never expected to find behind a wall.
And the rest of us were given a remarkable reminder of just how much can happen out of sight.
A house can look perfectly ordinary from the street. A few holes in the siding may appear to be nothing more than minor damage. But sometimes, behind that ordinary exterior, nature has been quietly carrying out an extraordinary project one tiny piece at a time.
In this case, that project involved one persistent woodpecker, countless trips back and forth, and nearly 700 pounds of acorns hidden where no one expected to find them.
Sometimes the strangest discoveries inside a home aren't the result of animals trying to move in.
Sometimes a wild animal simply looks at a house and decides:
This would make the perfect pantry.