One thing I have learned over the thirty years in pest management is that insects or rodents don’t always follow the manuals.  Though they (manuals) provide valuable information on the biology and basic behavior of these various pests, it’s not an exact science. 

Case in point, a colleague and I were called on to evaluate the source of a gnat condition in a newly renovated office building on the twentieth floor.  After our initial evaluation we were able to identify the insect as a Phorid Fly. 
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