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I've noticed in the caravan that when the windows are secured slightly open and left undisturbed, the spiders quickly create a natural insect barrier between the window and the frame. The webs are 3-D not the traditional flat plane.

Much to be grateful for with these little creatures. Someone was telling me the other day that dragonflies are important (to us!) for reducing numbers of mosquitoes.

Wasps do good too. We need the whole ecosystem