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Squirrels can open walnut shells, and they do it with surprising skill and determination.
If you’ve ever watched a squirrel wrestling with a walnut on a fence post, you already know these little acrobats have a few tricks up their furry sleeves.
Squirrels can open walnut shells thanks to sharp incisors, strong jaw muscles, and a whole lot of patience.
In this post, we’ll look at how squirrels open walnut shells, why walnuts are such a prize for them, and what happens when a squirrel just can’t crack that shell.
Let’s dig in.
How Squirrels Open Walnut Shells
Squirrels can open walnut shells, and the way they pull it off is honestly impressive.
Here’s how they get the job done.
1. They Use Their Sharp Incisors
The main tool in a squirrel’s walnut-opening kit is its incisors.
These front teeth never stop growing, which means they stay razor-sharp and ready for serious chewing.
A squirrel can open walnut shells by gnawing along the seam of the shell, where it’s naturally weakest.
This gnawing creates a groove that eventually splits the shell open.
2. Their Jaw Muscles Do the Heavy Lifting
Squirrels can open walnut shells because their jaw muscles are ridiculously strong for their size.
Once those incisors carve a starting point, the squirrel applies steady pressure until the shell gives way.
It’s not a one-bite deal either, and it can take several minutes of focused chewing.
That combo of sharp teeth and powerful jaws is exactly why squirrels can open walnut shells so reliably.
3. They Rotate the Nut as They Chew
Watch a squirrel closely and you’ll notice it constantly turns the walnut as it works.
This rotation lets the squirrel chew evenly around the shell instead of wearing down one spot.
By working the seam from multiple angles, squirrels can open walnut shells faster and with less wasted effort.
It’s a smart technique that turns a tough job into a manageable one.
4. They Sometimes Use Cracks to Their Advantage
Squirrels can open walnut shells more easily when the shell already has a weak spot.
A hairline crack or a dent from a fall gives the squirrel a natural starting point.
They’ll wedge their teeth into that gap and pry until the shell pops apart.
This is why you’ll sometimes see a squirrel reject a perfectly smooth walnut and grab a slightly damaged one instead.
Why Walnuts Are Worth the Effort for Squirrels
Squirrels can open walnut shells because the payoff is huge.
Here’s why they bother with such a tough nut.
1. Walnuts Are Packed With Fat and Calories
Walnuts are one of the richest nuts in healthy fats and calories.
For a squirrel that needs to survive cold winters, that energy density is gold.
A single walnut can fuel hours of scampering, climbing, and burying.
2. The Shell Protects the Good Stuff
That hard shell isn’t just a nuisance, it’s a storage advantage.
Walnuts stay fresh inside their shells far longer than shelled nuts.
So when a squirrel buries walnuts for later, the shell keeps the kernel from going rancid.
3. Squirrels Bury More Than They Eat
Squirrels can open walnut shells, but they also stash tons of whole walnuts underground.
Many of those buried walnuts get forgotten and grow into new trees.
That means every squirrel that cracks a walnut is also, accidentally, a tiny tree planter.
When Squirrels Can’t Open Walnut Shells
Squirrels can open walnut shells most of the time, but not every attempt ends in success.
Here’s when things go wrong.
1. Some Walnuts Are Just Too Tough
Black walnuts have exceptionally thick, rock-hard shells.
A squirrel can still open a black walnut shell, but it takes way more time and effort.
Young squirrels especially struggle with these tougher varieties.
2. Worn Teeth Slow Them Down
Older squirrels sometimes have chipped or worn incisors.
When that happens, a squirrel can’t open walnut shells as efficiently as it used to.
Those squirrels often switch to softer foods or scavenge leftovers instead.
3. They Drop and Lose Plenty of Nuts
Squirrels can open walnut shells, but they also fumble a lot.
A walnut dropped from a tree branch or a fence can roll into a crack or get buried in leaves.
That’s bad news for the squirrel and great news for the walnut.
Can Squirrels Open Walnut Shells? Yes, and Here’s the Bottom Line
Squirrels can open walnut shells, and they do it using sharp incisors, powerful jaws, and clever technique.
If you’ve ever wondered can squirrels open walnut shells, now you know the answer is a solid yes.
They gnaw along the seam, rotate the nut, and take advantage of any crack they find.
Of course, not every walnut gives up easily, and some squirrels, especially the young or the old, run into trouble.
Still, squirrels can open walnut shells well enough to keep themselves fed and to accidentally plant a few trees along the way.
So next time you see a squirrel hunched over a walnut, give it a little respect.
That little rodent is doing some serious work.