What's Wrong with this Picture: Uninvited Guests

ANSWER: Missing vent screen.  

This homeowner has some uninvited guests! This vent is missing a proper screen, and some birds have made a home of the vent opening. Birds will always jump at the chance to make one of these vents their home, as typically warm air is vented out. These vents are usually exhausting a bathroom or dryer. A proper vent screen should be installed to keep debris and animals out of the vent.

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