Homely bats

In my earlier post I mentioned that we built some bat houses. The idea started with my daughter that somehow is very partial to bats. Together we had observed these unique mammals flying around in the farm at dusk and we thought we could attract them into small houses to avoid them getting in our roof.

We Googled for bat houses or bat boxes and found a large number of ideas. Finally we settled for a simple design taken from a page such as http://picphotos.net/plans-for-building-a-bat-house-to-control-bugs/ and built one as a test case adding our own modifications such as the addition of an inner layer of cork for insulation against the cold and a piece of cloth at the bottom as a landing pad.

A few months later when we returned to Salta, we were delighted to note that about half a dozen bats had moved in! Being ambitious I built a second house following the same concept and the well-known premise “if it works, do not mend it or improve it”! Again, it got inhabited fairly soon after opening its doors to the bat community.

After a couple of years I noted that the first box only had one bat left in residence and I thought “they are clever and moved to the newer house and probably a grumpy old bat was left behind!”

Then a few days ago I noted that the last resident bat of the old box had gone. Its inner cork lining had detached from the sides and it was probably interfering with the bat movement so I decided to remove it to have a look and re-position the box at a better place in relation to the house and the prevailing winds. While unhooking it I noted that the bat was still there but hanging on outside the box and that for this reason I had missed it.

After opening the box, when I pulled the cork lining I disturbed a number of bugs that, when I exposed them to the light, rapidly withdrew to the darker recesses of the box. “Hmm, I thought, negative phototropism”, remembering my high school days!

IMG_2156 copy

The old box opened for servicing. One of the walls have been removed to show the cork lining. The bugs were underneath.

Thinking that the situation was worth further investigation I prepared to catch some of them to identify them at a later stage, if possible. While rummaging around the house finding some alcohol, a catching jar, forceps and a brush I was thinking that I had found a colony of pseudoscorpions, really interesting arachnids that I have found earlier living in the bat guano at the Suswa caves in Kenya. I still have the memory of entering the cave with my wife and Paul and finding thousands of bats inside while we walked on their soft guano that was truly hutching with pseudoscorpions!

In the opened bat box there were many bugs but without pincers! I could see clearly different instars, from reddish brown adults to yellowish showing a darker gut content that reminded me of old blood. After a while I could count their legs and decided that I was watching insects and then I realized that they were bugs of some sort! I confirmed my suspicion when I took pictures of them and even saw the eggshells like those of animal or human lice.

I was lucky that my children had given me a set of VicTsing Clip 12 X Macro+ 24 X Super Macro lenses that enabled me to take the 12X to 36X magnification pictures of the bugs with my cell phone.

Adult lice 1 copy

I then realized that the bug infestation in the box had reached such an intensity that the bats must had felt very uncomfortable and decided to move out, away from their tormentors!

All this is still hypothetical, as I have not yet identified neither bats nor bugs with any degree of scientific rigour! However, my educated guess is that the bats are Big brown bats (Eptesicus furinalis), based on work done in the area[1].

The identification of the bugs was more difficult as not much is known (and available to me) on bats’ ectoparasites in Argentina! Again Google’s existence proved very valuable. Bat bugs do exist and one species that has been described for the Americas is very similar to the ones I observed. These are the Eastern bat bugs (Cimex adjunctus).

They are closely related to the infamous Bed bugs (Cimex lectularius). So what? you would ask. Well, I made the mistake of informing my wife about this close bat bug -bed bug relationship and she was not amused that I had been “playing” with them. As a consequence I had to shower carefully before I was allowed in bed!


[1] Moschione, F.N. (2014). Relevamiento de Fauna. Finca El Gallinato, La Caldera, Provincia de Salta. Informe Relevamiento 2013-2014. 55pp.


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