Ian,
Those were likely made by one of a number of insects know around here as
"Mud Daubers". All are species of wasps that breed by capturing and
paralyzing some type of insect that they entomb in a mud tunnel after first
laying an egg on it. The larva lives off the captured insect until it
matures and makes its way out of the mud tunnel. They are very common here
and all are very non-aggressive. The mud tubes are unsightly but scrape
off easily.
Charlie
On Wed, Sep 11, 2013 at 5:28 AM, SwissPace <ian@xxxxxxxxxxxxxxxx> wrote:
>
> Kerstin has just texted me this image , they are about 2cm (1inch) long
> and our roof bedroom, I thought if anyone would know it would be this
> list collective anyone know what critter(s) made these
>
> <http://thattimeoflife.smugmug.com/Other/OMlist/i-h7P6gCr/A>
>
> Thanks Ian
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