Picture the Fallow deer, its nose deep in the grass as it snuffles around for something to eat. One thing it doesn’t have is an easy way to pick its own nose clean of whatever might find a home there.
I guess this line of thought can be extrapolated to all kinds of browsing and grazing animals.
What a lot we humans have to be thankful for.
So the Fallow deer has this symbiotic relationship with a jackdaw that picks off insects and whatnots, even into the deer’s nostril.
Click the image and then again to see a bigger version.
Photograph Works 
A great amusing scene.
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