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Squirrels, Chipmunks, And All Those ACORNS

November 13, 2012 by FHC

by Marjorie Rachlin

“Be prepared, winter is coming.” Squirrels and chipmunks have gotten the message. All over Forest Hills you can see them moving into winter quarters and filling up the pantries. This fall’s bumper crop of acorns is good news – a handy supplement to our bird feeders. (More on all those acorns, below.)

Most bird feeders are no match for the clever squirrel. (photo courtesy of Wikimedia Commons)

For squirrels, the ideal winter apartment is a deep hole in a big tree. If they don’t have a hole, they will stay in summer nests, those big bunches of leaves and twigs we see in the tops of trees. They are called “dreys” in the scientific literature.

Squirrels don’t hibernate, so we will be seeing them all winter, but they need to fatten up now. Often a grey squirrel will sit on my lawn chair turning an acorn round and round, gnawing, until the shell is off. Then he or she chows down.

A squirrel grabs a quick meal in a Forest Hills backyard. (photo by Patricia Davies)

After that it’s back to collecting. If you watch, you will see that squirrels investigate several acorns before putting a “keeper” in their cheek pouches. They reject an acorn that has a hole or has been eaten inside by insects. They are also fussy about acorns that have sprouted – they bite off the sprout so it will not grow anymore if they keep it.

Then they cache the nuts, usually by burying them in the lawn or the flower beds a few inches deep. This is their winter store. How do they find them again? Some experts say they have a great spatial memory and use landmarks; others disagree. All say that the squirrel has a good sense of smell, which helps it find its cache. As we know from experience, they miss a lot – thus helping to replant the forest.

We have a lot of squirrels in Forest Hills, but it’s a wonder we don’t have more. In an area like Forest Hills, rich in oaks and nut trees, the female usually has two litters a year, one in February/March and another in June/July. That’s the explanation for all that chasing around in January and May – the males are competing, although they do not actually fight.

There are 2 to 6 babies in each litter and they stay in the nest with their mother for ten weeks. After that they leave and are on their own, although several squirrels may den together in the winter.

Squirrels take advantage of our bird feeders and most eat well all winter. They can be a nuisance, but on the other hand, their antics and play are a joy to watch.

Chipmunks: The long sleep

Chipmunks, on the other hand, are going to spend the winter underground, coming out occasionally if the weather is warm. A chipmunk has a burrow of 12 to 30 feet in a maze of branching tunnels. When it gets cold, the animal sleeps there for two or three weeks, then wakes up, eats a meal, goes back to sleep.

Eastern chipmunk (photo courtesy of U.S. Fish & Wildlife Service)

Since their supply of food has to be in easy reach, they dig several chambers in their burrows. These are filled with nuts from oak trees, walnuts, hickories and beeches. One expert says that a chipmunk may collect 1000 nuts.

Chipmunks have their own fussy take on acorns. They like to find one that has a little hole in it, indicating that a weevil laid an egg there. They can probably tell if the egg has hatched into a grub. Then they gnaw it apart and eat the grub, a good source of protein. Nuts in good shape they put in their cheek pouches and take them underground.

Balance of Nature

A Forest Hills resident tells me that she has two red-shouldered hawks that sit on her porch railing, watching all the squirrel and chipmunk activity. Occasionally one of them swoops down and catches a meal. Predators like hawks and raccoons help keep the population down, and many also die from disease or food scarcity.

Red-shouldered hawk. (photo courtesy of Wikimedia Commons)

Why so many acorns?

White oak (left) and black oak (right) leaves (photo courtesy of Vanderbilt University)

Remember last spring when we were sweeping pollen off our porches and dusting off our cars? That was oak pollen, from those two-inch yellowy tassels hanging from the trees. Wind blows the pollen around, and some of it lands on the female flowers of the oak, which is little inconspicuous flower on the twigs.

Last spring had just the right combination of temperatures and wind pollination for our white oaks, the ones whose leaves have rounded lobes. This happens every 3 or 4 years, according to the books. A grown white oak can produce 10,000 acorns, and they have had a good year. Our black/red oaks, on the other hand, are bare. They bloom at a slightly different time – maybe next year, they will produce.

This accounts for the bombardment that Forest Hills residents got in October. Now there are white oak acorns everywhere on our lawns and gardens. White oak acorns sprout immediately, but luckily a lot of the tiny oaks die an early death.

The white oaks produced a bumper crop of acorns this fall. (photo courtesy of Wikimedia Commons)

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Filed Under: Backyard Nature, Local Wildlife

Comments

  1. margery elfin says

    November 15, 2012 at 2:46 pm

    Dear Ms. Rachlin,

    Why not have a fat squirrel contest in the neighborhood? I think our household would win.

  2. Tracy Johnke says

    November 16, 2012 at 9:13 pm

    Are the black squirrels I see around the neighborhood part of the same family or are they a different species?

    One of the black squirrels caught my eye recently because it had a white-tipped tail. I tried to get a photo but failed because it was being, well, squirrelly.

    • Marjorie Rachlin says

      November 19, 2012 at 2:59 pm

      those black squirrels are just another variation on the usual grey squirrel. they are the same species.

  3. Aviva Kempner says

    November 19, 2012 at 9:54 am

    Thanks for explaining why I had so many acorns and had to wear a helmet or at least protect my head going to my car with so many falling down.

    • Tracy Johnke says

      November 19, 2012 at 10:28 am

      Yes! I felt foolish doing the “duck and cover,” but those acorns seemed to have it in for us.

  4. Bill Eck says

    December 13, 2012 at 3:33 pm

    It isn’t clear why Oaks and other nut bearing trees periodically have “mast crops” but the leading theory is that it is related to the date of the last frost in spring. If this is the case, look out next year for a bumper crop of acorns from the Black/Red/Scarlet/Pin Oak half of the Oak genus. White Oak acorns mature in one growing season while Red Oak acorns take two. If the environment is the cue, then I expect this spring’s mild weather may portend a mast of Red Oak acorns late next summer.

  5. Joanne Surprenant says

    December 9, 2015 at 4:49 pm

    I bought acorns thru the internet, but how many acorns should I give my one outdoor squirrel per day
    If you have a book that answers squirrel questions please let me know

    • Joanne Surprenant says

      December 9, 2015 at 6:14 pm

      how many acorns per day should I feed my outdoor squirrel

  6. Joanne Surprenant says

    December 9, 2015 at 6:12 pm

    how many acorns per day do I feed my outdoor squirrel

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