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Archive for March, 2010

After pondering the infra-red question for a week, I decided to try and get some answers in the field.  I decided to pay another visit to the sett, to observe the badgers as best as I could without using the infra-red and then, once I was sure that the badgers were comfortable and that there was nothing I was doing that was disturbing them, I would turn on the IR and observe any reactions.

It was a great plan.  The problem is, to paraphrase Helmuth von Moltke, no plan survives contact with badgers.  I made my way through the wood as stealthily as possible and arrived at the sett by 8.00pm.  Unlike last week, when the weather was very clear, the night was quite cloudy.  This meant that there was more of a glow in the sky – the horrid orange reflections of the streetlights in distant towns.  This glow was enough to make it possible to use the night vision scope in passive mode, without the infra-red illuminator.  There was just enough light for it to work properly – I could see trees, undergrowth and the spoil heaps of the sett.

Unfortunately I couldn’t see any badgers.  I waited for 40 minutes but saw and heard nothing.  If the badgers had come out I would have seen them.  Maybe they were frightened by my approach, but I don’t think so.  Maybe they had left already and were out foraging.  Maybe they didn’t emerge until after I had left.

It was a pleasant enough evening, listening to the lambs in the field and the tawny owls in the wood behind me, but I didn’t get to test my theory.  I’ll try again next week and see what happens.

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For anyone who has any questions about wildlife in Britain there is a fabulous resource that’s free and available to anyone.  This is the Wild About Britain website, and in particular the forums there.  You can ask any question and get an answer from a huge range of experts and enthusiasts.

I asked the question about badgers being able to see the infra-red light from my night vision scope, and one response seemed to match my experiences exactly.  This is from a WAB member called stripee:

Yes they can see it and always react. Some more nervously than others. I have a night vision scope with infra red. The badgers, foxes etc don’t like it shone in their eyes. I try to shine it for short periods and not directly at them.

If you look at your scope when the red light is on from the front it can be seen for a long distance at a certain angle. I had heard that badgers don’t see red light, but it just isn’t true.

This is good.  This backs up what I have observed.  It isn’t scientific proof yet, but it adds to the anecdotal evidence.

I’ll keep searching and see what else I can find out.  In the meantime I’ll also try some informal experiments  and see if I can get some more evidence.   There are more formal experiments that could be done to prove the matter one way or another (I’m thinking of a version of the Skinner Box with an infra-red stimulus) but I’d need a fairly captive population of badgers to try it on.  If any biology students are looking for an idea for a project, let me know…

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This is an open question to any and all badger experts out there.  Can badgers see infra-red?

I’ve used my night vision scope twice now (see Fieldnotes: 25th July 2009 – First night vision session and Fieldnotes: 6th March 2010 – A frosty night at the badger sett).  On both occasions the badgers have been visibly spooked, presumably by the infra-red light.  Of course, this is purely anecdotal evidence – I haven’t done any sort of scientific study – but I’ve spent enough hours watching badgers to know when one is disturbed by something, and all the ones I’ve seen through the night vision scope have indeed been disturbed.

Of course, it might not necessarily be the infra-red.  The night vision scope (it’s a Bresser, by the way) may be doing something else to frighten the badgers.  It may make a noise that is inaudible to us but audible to badgers, for instance.  I don’t know.

So, has anyone had experience of using a night vision scope to watch badgers, particularly with an infra-red torch?  Did you notice any signs that the badgers were aware of it?  Does anyone know of any research or literature on the subject?  Does anyone know if any other animals can see in the infra-red end of the spectrum?

If you have any ideas or experiences, please do let me know.  I’ll keep searching myself and let you know if I find anything.

Thanks

BWM

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When Labour MP Ron Davies was asked to explain what he was doing visiting the countryside at night in a well-known gay meeting area, he famously replied that he was ‘watching badgers’.  I mused on this as I walked through our village last night.  If for some reason I had been stopped and asked to explain what I was doing, how would I explain why I was carrying a red light and a night vision scope while wearing (among other things) a camouflage jacket and a pair of ladies’ tights?  I expect I would have weakly stammered out the same reason that Ron did.  I can’t vouch for him, but in my case it happened to be true.

It has been a while since I have seen a badger.  Partly this is due to family commitments, partly because I’ve confined my badger watching to the summer months when it is possible to observe them in daylight in the long evenings.  I’ve always tried to keep the main badger sett I watch as wild and undisturbed as possible, and for this reason I’ve never used artificial lights there.  However, I bought myself a night vision scope last year, so it should be possible to watch the badgers in complete darkness.  Everything came together at the same time – I now have time to go out in the evenings, I have the means to watch the badgers in the dark, and I had an itch to see a real, live badger again.  I know from visiting the sett in the daytime that the badgers have been busy – it was time to get out and see what they were actually doing at this time of year.

This explains why I was out after dark and why I was carrying the night vision scope.  The reason I was wearing ladies’ tights was purely and simply to keep warm.  Last night was beautifully clear – the stars of Orion were shining brightly over the wood as I walked up the hill – but it was very cold and frosty with a bitter wind that seemed to be blowing straight from the arctic circle.  If you’ve ever sat still in very cold weather then you’ll know how the cold can seep into your bones after a while.  And if you’re up a tree watching badgers then you can’t even move around to keep warm.  Hence I was wearing as much warm clothing as I could.  I got the tights for an impromptu fancy dress outfit a while ago (Superman – they’re thick, blue tights) and I was struck by how warm they were.  Despite the possible cross-dressing implications I wore them under my normal trousers, and very effective they were too – warm yet lightweight.  This may become a habit…

Arriving at the wood I picked my slowly through the trees.  I use a small red LED headtorch, which is just bright enough to see by but is less intrusive than a white light.  Badger folklore says that badgers cannot see red light very well and are not as disturbed by it.  It also adds a wonderfully other-worldly feeling when walking through a dark wood.

I arrived at the sett at 8.00pm, none too stealthily, I’m afraid.  Walking through a winter’s worth of dead leaves and fallen twigs by the light of dim torch without making a noise is pretty much impossible.  As I neared the sett I could see the red eyeshine of an animal at the edge of the torchlight – a badger!  With no real stealth at all I climbed up my favourite tree to get a good view over the sett.  I set up the night vision scope and turned off the red torch.

Now, the last time I used the night vision scope it seemed to cause a reaction in the badgers (see Fieldnotes: 25th July 2009 – First night vision session).  Although the infra-red light from the scope is supposedly invisible, the badgers seemed to be spooked by it.  Last night, the exact same thing happened.  When I looked at the badger through the scope it froze, looked straight at me and bobbed its head up and down.  This is the classic sign of a nervous badger trying to scent something that it is suspicious of.  After a few seconds it turned around and fled underground.

I am now convinced that badgers can see the infra-red light from my NV scope.  Think about it – the badger was not put off by my noisy approach, it was not put off by the red light of my headtorch, nor by the noise of my climbing the tree.  It was only when I was sitting quiet and still with my torch turned off that it bolted; and this at the exact moment I shone the infra-led light on it.  I’ve spent a lot of hours watching badgers, and the way that this one looked straight at me tells me that it was aware of me, and this could only be due to the infra-red.

I sat for 40 cold minutes to see if the badger reappeared but it didn’t.  I could hear the rhythmic scuffling noises of a badger gathering bedding from the other end of the sett, but I didn’t see anything else.  It was a little frustrating:  there I was, all dressed up, and I seemed to have scared off the only badger in sight.  I can confirm that the badgers were out at 8.00pm and that there was bedding being gathered (the east end of the sett seems to be active, based on what I heard and from inspecting the sett in the daylight) but I can’t add much more than this.

The business with the night vision scope was frustrating too.  I am sure that the badgers react to the infra-red light, and this makes it much less useful.  In fact, they seem more disturbed by the night vision scope than by an ordinary red light.  I can use the scope in ‘passive mode’ so that it gathers ambient light rather than illuminating the scene with infra-red, but it isn’t very effective in the darkness of a dark wood.

There is definitely an opportunity for more winter badger watching, but I need to sort out the night vision first…

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