When I was changing the oil last week I noticed some debris hanging out of a drain hole behind the bumper. When I investigated I found a mouse nest that came with my XF a year ago when I bought it. There also was a Top Cat mouse trap laying on top of the splash panel when I accessed the drain plug.
The outside air temperature probe was dislodged although the temperature I was reading on my dash was OK.
This mouse was very comfortable with his big nest of cotton.