I recently came back from holiday to find my bathroom window sill covered in about 40-50 small brownish beetles, and I was wondering if anyone on here could help me identify them? I have attached 2 photos below, which I hope are a good enough resolution. It looks like there are 2 different types of beetles from these pictures but I'm no expert. From googling it occurred to me that these might be wood worm beetles. For information the bathroom is upstairs and there is no food stuffs anywhere near.
Please could you help?
I think we will need a better picture. Do you have any old timber or furniture? I notice you have PVC windows, and if you're in a new house your structural timber is likely to be well protected. Beetle emergences like this tend to be Dermestidae which will have fed on, generally, old natural fibre clothing, not timber. Woodworm infestations are usually noticed from the exit holes and wood dust.
I added some more pictures to the original post - I must confess I'm having difficulty getting a good photo of something so small. I have looked for dust and holes, in the bathroom - even removing a shelf above the toilet in-built cistern and going into the loft above, but I cannot see any. I have discovered some droppings in my loft though (I suspect squirrels), could this be a cause?
When I lived in an old victorian terrace in London I used to see beetles like this quite a lot and always assumed they were woodworm of some kind (probably furniture beetle). If so, they can come from any source of timber that hasn't been adequately treated.