Mud-wasps and aircraft
Have also had issues with these - a pitot tube cover left off over night and despite an inspection, wasp had climbed well to the back of the tube - after no airspeed change - static vent selected and OK. Took a disconnection at the asi and a full blow back by the lame using air. Then the little blighter "popped Out" - no more problems.
The wasps seem to prefer horizontal "hollows" rather than vertical ones.
The relief vent for the fuel tank can also be a target, or the oil breather tube - not normally covered by a "tube-cover" - A few more inspection points in wasp season!!
Good and timely advice!!!