How big a gap can mosquitoes pass through?
Well because insects have an exoskeleton that restricts compression or extension of the body, they would only be able to fit into a space that is greater than or equal to the diameter of their body around the Mesothorax (middle thoracic segment). Because flies (mosquitoes included) only have one pair of wings, the mid-thoracic segment is the largest because this is where the wings are located on the body, and this is the segment which houses the large flight muscles, thus making it the largest part of their body in terms of diameter. So to answer your question, you would simply have to image in the diameter of the mid region of a mosquito…of course this is not obvious, but a safe bet would be window screening, there are no mosquito’s small enough to fit through standard window screening. For around the doggy door, you can also try weather stripping perhaps. Mosquitos are also very sneaky and usually enter homes as soon as you open the door. They typically hang around lights, so if th
