My daughters calls them "sucking-blood spider", because of their long legs, especially my younger one, she was so scared that she would rather hide under duvet sweating, until I catch the fly and threw them out. Crane fly looks like 'giant mosquito', and seem to be weak and poor flier, and very easy to catch. This afternoon, I saw two crane flies stayed very close on my windows, so I asked my daughter to take a photo of them. Then after about one minute, they started to mate. What a scene! crane flies courting Crane fly mating