It could be...
but also that is a place where mold can grow...
spray with lysol or Fabreez.... for quick relief....( but may need to go in and really clean at some time ) when the fan is on and near the intake...
But we keep the glue traps inside our cars out here in the country... regularly catch mice...and I also had acorns stored inside my air cleaner ( but on the safe side away from the engine ) when I left off the long intake hose once...
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