Post details: Why do spiders come indoors in the autumn?


Why do spiders come indoors in the autumn?
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A perennial question on this site's extremely popular Ask the Ranger facility is "Where do spiders go in the winter?" (So much so that the answer is given on the same page and can be found here).

At this time of the year, however, more direct approaches to The Ranger are common, as spiders start appearing indoors all over the place and startled home-owners seek advice from their nearest spider enthusiast. So The Ranger was prepared when Naturenet designer Cat posed the question "Where do spiders come from in the autumn?", or, more specifically, why is Cat's flat filling up with spiders?

Tegeneria in Cat's bath © Cat James
The spiders use Cat's bath more than she does!

On investigation it did indeed seem as though Cat's place was a great attraction for one of the largest spiders in the UK - Tegenaria duellica. In her bath was an impressive male spider; and further searching, urged on from a distance by Cat, revealed two more similar males hiding in the kitchen sink. These two seemed to have fallen out with each other, and despite having somewhere lost two legs each, were intent on combat.

Removing a spider © Cat James
Cunning use of a beaker and a postcard of Frankie Howerd!

Using suitable equipment it is usually possible to capture even the largest specimen safely, and all three of the spiders were put in a plastic box safely.

But this still leaves some of those questions that The Ranger is often asked - and here come the answers.

Why do spiders come indoors in the autumn? Not surprisingly, most spiders don't like it in houses, as they are too dry and clean, with little food. But there are also few predators, so a few species have got quite used to houses, and some live hardly anywhere else. But in the autumn particularly, a range of species which normally stay outdoors start coming in. That is why they suddenly seem to appear from nowhere. The errant spiders are almost always males, who having reached maturity now set off in search of a female. Most will remain outdoors, but as they are quite adventurous some will by random chance end up in your house.

Why do spiders like the bath? Well they don't particularly, but they can't climb the sides. They may fall in just by chance, or they might be attracted by the moisture, but generally once in they can't get out. This is especially true of large spiders which, unlike most small species, cannot walk up smooth surfaces, so that's why big spiders end up in the bottom of your bath. Unable to run off and hide they are stuck there until you discover them. It's often suggested that spiders come up the waste pipe - well, they might go down there but only if they have fallen into the bath in the first place, as they can't swim up through the S-bend in your waste pipe any more than you can. So if you take a bath often enough there shouldn't be any spiders down the plughole. If this still worries you just sluice the plughole out a few times, including the overflow. Spiders have no magic survival abilities and water will wash them away just like anything else.

The easiest way to get them out of the bath is to drape a towel over the bath's side, with enough towelling inside the bath to enable the spider to climb out. Then leave overnight. This technique, although humane, is not universally popular amongst those afraid of spiders as, obviously enough, it will not necessarily get the spider out of your house.

How do I get rid of spiders in the house? Tricky. They will probably just wander off again if you let them, and certainly by the time it gets at all cold most will be dead or dormant somewhere. But you can always transfer them to the garden with the Frankie Howerd technique (above) or even a specialist tool like the Spider Catcher. The Ranger has tried one of these out and it's actually pretty good - hard to harm the spider and ideal for even the squeamish. There's no point in using pesticides - it won't do you any good to have that stuff in your house and as the spiders are coming in from outside even if you kill them indoors they will come back pretty much straight away. Better to keep your doors and windows shut, and get the cracks sealed up, then no more spiders can gain entry (and your house will be warmer too!).

So, what happened to Cat's three spiders in the plastic box? The video above shows a moment from the very prolonged tussle of the two lively six-legged protagonists. Neither seemed likely to harm each other, and eventually The Ranger took pity and took them down the garden to release safely into the hedge. No doubt he'll be doing the same for their progeny this time next year!

9 comments so far, see them and add yours here!

Posted on 16th September 2007 at 1 10 pm
by The Virtual Ranger
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Categories: Spiders
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Comments:

Comment from: Heurrgh
>>can't swim up through the S-bend in your waste pipe any more than you can.

Balderdash. Last year I found an absolutely HUGE tarantula like spider (Umm... well, about 1.5 inches across, but it was big and hairy) and flushed it down the plug-hole in my bath which has a lift-out grating thing. I flushed it with HOT water for a minute to make sure it was dead and had gone round the S-bend. I put the plug in, ran a bath, soaked for 40 minutes, and when I pulled the plug out...the thing shot up to the surface of the water - legs wiggling like crazy.

I figure it has super-spider powers or had invented an insectoid rebreather system or something. Anyway, I'm still traumatised, and I've avoided washing since.

The Ranger responds: thought I could smell something... my vote's on the overflow pipe - you gotta flush that through as well ;)
PermalinkPermalink 16/09/07 @ 20:10

 

Comment from: Daniel Email · http://www.deguia.net
Wow! Looks remarkably similar to the two I found in my house in Northern California (Only got pictures of one of them)

The Ranger responds:
looks similar; it's a large male spider for sure. However it doesn't look like Tegenaria sp. because the spinnerets (where the silk comes from) are too small. So that'll be some local US variety I guess. You'll need to seek local advice for any better ID than that. Nice pics though - hope you weren't too traumatised by your early morning adventure!
PermalinkPermalink 17/09/07 @ 15:31

 

Comment from: The Wildlife Gardener [Admin] Email
I laughed my socks off - what a great article. Not only Frankie Howerd but the theme from Rocky too!! Keep 'em coming.
PermalinkPermalink 17/09/07 @ 18:05

 

Comment from: ghostmoth Email
Fascinating article! A non-humane alternative is to keep cats - they certainly keep the spider population down!
PermalinkPermalink 18/09/07 @ 13:53

 

Comment from: Tim
To get rid of spiders is easy. Cut the bottom off a plastic drink bottle (keep the screw top lid on), and cut the end off a plastic food carton tray. Place the bottle over the spider, slide the tray underneath, turn the whole thing over so that the spider falls into the bottle, and cannot get out. Then release in the garden well away from the house.

When hanging clothing out to dry keep them well away from ground level. If you have alleyways and paths nearby, keep them well swept. Remove old leaves, pieces of wood, and anything else where spiders can hide. Keep windows closed, especially if near trees or bushes.You could put a small pile of wood in the garden somewhere for spiders to go to.
PermalinkPermalink 23/09/07 @ 22:10

 

Comment from: kevin Email
I thought I was the only one that used the glass and postcard technique!! had a huge one in the bath 2 days ago. Just wondering, what are they (it looked like the one in the picture) are they dangerous(!), or are they scared and harmless or what!!??

The Ranger responds:
It's probably a species called Tegenaria duellica, and they're not at all dangerous to us - although they're probably quite dangerous to flies! You're most likely correct in that a spider in the bath is more scared than anything else.
PermalinkPermalink 02/10/07 @ 02:11

 

Comment from: margaret mitchinson Email
Hi, i'm getting a lot of spiders in the house...a few months ago a had about 12 tiny spiders in and around my bath.. the next day a had another seven...i had one on my pillow at night..and just had another crawling on my ear just as i was about to go to sleep..but these were not little ones...the first one was the size of a fifty pence peace..i'm getting so i cant go to sleep..for looking for spiders what can i do regards margaret

The Ranger responds: not sure about that - sounds like a lot of spiders. I don't suppose they want to be in there either. Other than keeping the doors and windows shut and cleaning up the house, it's hard to know what you can do. Certainly once the spiders are outside they shouldn't want to come back in, although maybe they are coming in by accident.
PermalinkPermalink 05/10/07 @ 12:45

 

Comment from: hobospider Email
Six legged combatants? Arachnids have eight legs

The Ranger responds: watch the video, hobospider. Count the legs. They might have been born eight-legged, but these guys have lost a brace each - as it mentions in the article.
PermalinkPermalink 19/02/08 @ 17:39

 

Comment from: Terry Email
The spider in the bath.... i had one similar looking to it, but it was MUCH bigger. Its entire size with spread out legs was as large as a dinner plate. this is not some imagination of someone scared of spiders, i kinda like them. But this one was that big i could'nt believe it, and didnt touch it as i had no idea if it was dangerous. Any idea what it was ? iwas going to ask my pet shop but my dog kinda found it a nice snack.
PermalinkPermalink 22/05/08 @ 00:57

 

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The thoughts and writings of The Virtual Ranger, since 1995 the host and mascot of Naturenet, the UK's most popular independent environmental website; along with interjections from his real-life alter ego, Matthew Chatfield, and others. Featuring not only Naturenet and countryside related stuff, but, as on Naturenet, plenty of other material - more or less at random - that takes The Ranger's fancy. But you can be confident that soon enough he'll be rather sarcastic.

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