Last night I saw a strange 'thing' on my laptop screen. It was black, about a quarter of an inch in length, looked just like a thick piece of cotton thread, but it wriggled. Then today I found a tiny crop of the same kind of creatures wriggling on the wall half way up my staircase....what are they?? There are none in the kitchen, they weren't found near an open window, they dont seem to have legs or wings. I don't have pets but do have the windows and doors open most of the time.
Confused of Wellington