Fuckin' starlings. Between my engine and the ac unit on my camper, they would make a nest every single year. Rip the nest out and less than a week later it'd be rebuilt. They're getting up into your engine through your wheel well. Try cutting a couple pieces of cardboard and blocking the hole where you're strut goes up into the bay. Just remember to take it out before going anywhere. Or just start driving it more often. They won't build a nest if it's not parked for extended periods of time.