Squirt some ant killer in the hole and see what comes out.
@SuePJ recommended cinnamon to me the other day and the jury is still out. I bought some in stick form and put one where I think they come from and havenât seen them there since, but there are a couple who come in on the other side of the sink sometimes, so maybe, but not sure.
It needs to be powder - they canât cross it. A stick, they can walk round. 
Yes I realise that, but it was in stick form so I just put one in place in an experiment and either it worked or not I donât know but no more came from that direction. Just one, or at the most 2, arrived from the other direction a day or so later and I am waiting to see if the stick worked or not as scattering powder on a sink surround will not last long before it is a sticky mess. 
@JohnHâŚif you are concerned âŚand you are, mix up some sand and lime (chaux blanche NHL 3.5 or so) with a bit of water and plug the recesses. Make the lime sand mortar quite stiff. Leave it a few days and if you see some holes re-appear, then you probably have some ants happily living the there.
Personally, and so, I would leave themâŚthey are totally clean and also will clean your house but thatâs up to you of courseâŚ.
ohâŚdonât use cement and bay a bag of lime ( 3x the cost but then you can join the âlime bore clubâ and feel you have done something hugely important for the patromonie of the worldâŚ
Oh 3: 1 proportion (3 sand 1 lime )
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Too late, Iâm already there. Weâve been pointing the back wall and chipping off the cement ârepairsâ.
Trop 
And now edited to make sense 
A new bird âspottedâ this morningâŚhow exciting!
Western Bonelli warbler.
And yesterday, a lovely pair of Short toed Snake EaglesâŚ
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weâve got Short-toed Snake Eagles⌠never seen 'em in shirts 
joking apart, the bird-life here in France is absolutely wonderful 
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HahahâŚfixedâŚbloody auto smell chacjerâŚcasherâŚchecker
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Mine, which I didnât put there, doesnât change anything thankfully but just underlines in red and then I have to sometimes experiment or ask Google to get the right spelling, a skill which age is sadly depriving me of.
But Google comes with a warning, be mindful of the Yanks.
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Sometimes, learning both the Latin and the French common names for birds is too much. So, I resort to this guide to help remember. Much easier:
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While Iâm laughing at your post, itâs important to me to keep seeing the French names as my pals/neighbours love to discuss the wildlife.
When I speak French, I find it easier to recall words I have seen written, thus need to see the correct words..
and I have to find ways of differentiating between similar words..
Try saying Blue Tit in French.. is it Mensonge or Mesange ??
My way of remembering is that Bluetits are angels and donât lie but Men Do lie (ok and women too )
I agree totally and like the common names of birds (and butterflies), the French names are quite romantic but sometimes difficult remember and a good friend of mine who is a proper twitcher only knows to common Dutch names for birds. So the Latin names are useful just for clarity but our pronunciation is awfulâŚ.
âŚHence we call many species âsimonâ or âdebbieâ etc..
Nice web site by the way!
.and this is my point of reference plus the Cornell bird app to identify birds by sound only.
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Thanks for the reference @MikeyPotts I have loaded the app.
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OH has finally loaded it on his phone, and walks now take twice as long. We thought we could hear nightingales, but v surprised as quite far north and Merlin has confirmed this. Of course havenât actually managed to see one!
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Maybe even further north, sometimes?
I canât find the info at the moment but thereâs a group of scientists tracking a âflockâ of nightingales from Africa into UK but in the meantime, a nice article:
And
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