Last year it was a mouse in the MH...now this spring it is a #$%& black bird building a nest in the fifth wheel pin cavity of the trailer. The other day I pulled a couple "basketball" size bunches of twigs, grass, etc. from between the plate and floor. I put small boards in all the access holes and the $%&^* bird pushed one aside and started building again. There are also some 1"+ diameter holes that it may be using too. Today I bought some screen material and going to put screen in all the openings. I will also camp out with the .410 and feed the bird some lead BBs. Between the mice, birds, skunks, groundhogs, and foxes...I have a proverbial wildlife zoo at the farm. There are two (2) barn owls around the farm. I thought owls scared birds away. Does the cavity between the plate and floor continue thru to each side or is there a divider in the middle? Thinking of using an air hose and blowing all the crap out. I should have invested in a puddy cat to take care of not only the mice but the birds too. Sufferin Succotash!