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If acorns are poisonous, why don't squirrels die?
11/30/2008 12:19 AM
By BILL HAYES
Columnist

As mentioned before in this column, we get all kinds of questions in the Master Gardener office at the Aiken County Extension Center. Many of the questions are routine but occasionally we get one that needs plenty of research. The other day we received the question: "Are acorns poisonous"? Most of the time we answer without questioning the caller but in this instance we asked why they needed to know. If horses or cattle are involved, we have to direct the question to a higher authority. The caller responded by telling us that they had spent most of the night tossing and turning because, if acorns were poisonous, why didn't squirrels die?

This seemed like a question that might keep me up too so I decided to do some research. My first source for information is always the Clemson HGIC website but it had very little information on acorns. I then turned to the Internet which has just about everything. I found a few articles that indicated that some acorns were poisonous to certain animals but I found many more articles that not only said that they were good to eat but they also provided recipes for acorn bread and roasted acorns.

New Zealand and West Virginia must be having problems with sick or dying cows and sheep because I found several articles about the effect of acorns on livestock. The articles referenced red acorns as the culprit and discussed how the toxins in the acorn can break down their digestive systems. Red acorns have more than double the tannin content of white acorns. To distinguish the two, red acorns come from pointy leaved oak trees like the red, black, pin and willow. White acorns come from the white oak tree that has rounded leaves. The swamp, bur and water oaks fall into this category. Horses can have problems with red oak acorns if they eat too many. To be safe, keep all farm animals away from acorns especially if you can't distinguish the difference between red and white.

I found all sorts of stories about Native Americans eating acorns as part of their daily diet. I also found one article that said that the average life span of the American Indian was 30 years but made no reference to acorns as being part of the problem. Because of the high tannin content in red acorns the bitterness was probably strong enough to discourage all but the very hungry.

I finally located an article about squirrels and acorns. It turns out that gray squirrels have an enzyme in their system that protects them from the effects of red acorns. It doesn't change the taste, which is very bitter, but it does prevent a toxic reaction in the stomach. Most squirrels in Aiken are gray but we do have a few red ones too. Red squirrels are not as lucky as the grey and have no protection against the toxins in red acorns. Maybe that's why we have so few red squirrels.

Most of our squirrel calls are from non-squirrel lovers. They want to know how to get rid of them. There is usually a bird feeder in the discussion and bird feeders are squirrel magnets. Many are sold as "squirrel proof" (excuse me for a moment while I try to contain my laughter)! Squirrels go to a special school to learn how to overcome "squirrel proof" feeders. Upon graduation they train other squirrels and soon the whole neighborhood has a group of Green Beret type rodents capable of breaking into Fort Knox. The simplest way to create a "squirrel proof" bird feeder is to offer items that the squirrels don't like. I would start with red acorns.

A well-fed dog will usually avoid acorns. That doesn't mean that they won't try one if it's available. The first bite will probably be the last because of the bitterness. A vulnerable dog will be one that is undernourished or fenced in with an oak tree in the yard. Too many acorns will cause digestive problems and a weakened dog or puppy could have severe consequences. Rake up the acorns if your dog has full access to them.




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Comments
2 comment(s) found!

Posted by: KC On: 12/25/2008

Comment Title:
This is very neat. I had heard before people saying acorns were poisonous, but never believed it. Thank you.


Posted by: Angus Macmillan On: 12/1/2008

Comment Title: Scapegoating Grey squirrels in the UK
Scapegoating Grey Squirrels 1.Native Species? One of the key criteria for determining if a species is “native” by conservationists is that it should have evolved with all other species within its own ecosystem and not have been introduced or assisted by man to arrive at what is regarded as its natural location. In short, it should have got to where it is by its own efforts and evolved naturally. However, the word “species” is only a descriptive term within an arbitrary classification system, so it is ridiculous for conservationists to latch the adjective “native” onto a classification, when in the real world it should relate to individual animals that have been born and bred in a location to which their native standing rightfully applies. If it is important to conservationists that a species evolves naturally in Britain to earn its “native species” status, then it should be equally important that the same species evolving in a different natural environment abroad, should not be regarded as “native” to this country. An example of this is the red squirrel, which has a range stretching from Northern Europe to China. It takes an enormous stretch of one’s imagination to regard red squirrels anywhere from here to China, as being native to one particular location. These animals have evolved within a wide range of climatic and environmental conditions and associated with different flora and fauna encountered across the part of the range they inhabit. For conservationists to argue that these influences are not important is to argue against their own concept of “native species”. Ancestors of the current population of red squirrels in the UK have been largely introduced (reintroduced?) from various parts of Europe, following their virtual extermination by those with forestry interests who regarded them as “tree rats” – a term now being used, just as unfairly, to demonise grey squirrels in the eyes of the general public. Both populations of squirrels, red and grey, have been introduced to this country and there is no evidence that even the earlier red squirrels evolved here continuously from the time of the land bridge to Europe around 10,000 years ago. All squirrels born in this country are “native” by birth, just as we are, irrespective of colour, background or success. To expect racial tolerance within own population but condemn wildlife on the basis of its ancestral background is extremely hypocritical. 2.Habitat If conservationists want to assist the reds to survive, they should be improving their habitat by planting trees in which they thrive, instead of the political fad of wallpapering the countryside with native broadleaves that favours the greys' expansion and the reds’ demise. The need to plant trees that favour red squirrels and act as a barrier to greys is well known to the Forestry Commission. 3.Squirrel-pox Virus (SQPV) There is no evidence that greys are transmitting squirrel-pox virus (SQPV) to reds as the presence of antibodies in greys merely means they have been in contact with the disease, most probably by associating with reds or possibly other rodents. Research by McInnes et al acknowledges “the possibility that the virus is endemic to the UK and that other rodent species inhabiting the same woodland environment could be harboring the virus”. The Forestry Commission have admitted under a Freedom of information request that “no routine testing of live red squirrels is undertaken” and they “are not aware of any scientific evidence one way or another as to whether or not there is a resistant population of reds out there”. So it is quite wrong to say red squirrels have no immunity to the disease, when the truth is nobody knows. Indeed, the population could well have been wiped out long ago if there were not some form of resistance present. Early in the last century, out of forty-four districts in England where red squirrels had the disease only four districts had grey squirrels present. This suggests that SQPV has been within the red squirrel population for around a century at least and that grey squirrels are victims of a campaign of unfair vilification. Some people even have the audacity to claim that SQPV somehow arrived around the time it was discovered in 1983 but that is about as ridiculous as claiming America didn’t exist before it was “discovered” by Leif Ericson – centuries before Christopher Columbus was born. 4.Immunocontraception Immunocontraception was deemed immoral in the 1930s in mainland Europe, when it was proposed against sectors of the human population. It is equally immoral to use it against wildlife, as it could affect non-target species and introduce a significant risk of unintended consequences. Unscrupulous conservationists and others could also use it as a weapon of destruction of any species in an attempt to control nature. How long before this dangerous technology, if perfected, could be used against the human population? It is not a route that should be considered by right thinking people. 5.Culling of Grey Squirrels Culling doesn’t work except in closed environments such as islands. According to research it would cost £200,000 per annum to control grey squirrels in Northumberland’s Redesdale Forest alone. - Rushton et al (2002) – and would require to be repeated endlessly as greys will quickly re-colonised voids, sometimes within a few weeks. Culling greys in Scotland will be an expensive and futile exercise requiring to be continued for evermore. “Squirrel culling is not a new phenomenon. Some 60 years ago the Ministry of Agriculture started to encourage people to kill squirrels, offering—I remember it only too clearly—a shilling a tail. I became a very wealthy young man at that time, as we had a lot of grey squirrels in the area and I did not need a lot of encouragement to do something about them. When the government at that time had paid out some £250,000, they decided that that was enough. There was no perceivable difference to the squirrel population.” Lord Plumb, March 2006 6.Humane dispatch What is Humane? “Humane” and “humane as possible” are words frequently used by conservationists to describe the killing of wildlife. So what exactly do these words mean or are they merely euphemistic references to brutality? Conservationists are currently engaged in what they call the “humane dispatch” of grey squirrels by clubbing them over the head with a blunt instrument, yet if the same happened to one of our own population it would be described as a brutal murder. Putting aside the argument of whether a human life is of greater value than that of a squirrel, it is logical to say that if the method of dispatch is exactly the same there is no excuse for describing it differently. Perhaps the idea of the ”brutal dispatch“ of wildlife and “humane murder” of humans is too much for the human animal to contemplate. 7.Act of violence Make no mistake, clubbing a grey squirrel over the head is an act of violence and is being promoted nation-wide by government and red squirrel groups. Scientific evidence shows that those who have little regard for the welfare of animals are likely to have a similar attitude to their fellow human beings. Abuse breeds abuse and in our ever-increasing violent society, what example is it to younger generations that violence and killing is an acceptable solution to a perceived problem of not being native to this country? In reality, rather than in the arbitrary world of conservation, all squirrels born in this country are as “native” by birth as we are, irrespective of our colour, background or success. To expect tolerance within our own population but condemn these animals on the basis of their ancestral background is extremely hypocritical and perhaps only one step removed from racism. It should also be appreciated that squirrels, of any colour, are not “ours”. They are independent parallel mammalian populations that inhabit this planet the same as we do and should be afforded the same respect and consideration to live out their lives that we expect for ourselves. The Grey Squirrel Native by birth – Condemned by origin Please read the website www.grey-squirrel.org.uk A Macmillan, Meikle Boturich, near Balloch, Dunbartonshire G83 8LX Tel. 01389 756424 Fax. 01389 756723 Mob. 07836 548665 Email. amacmil304@aol.com September 2008 ©




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