Quirk of a resident squirrel who I see around my yard:

The very tip of its tail looks like it has major portions of fluff pulled out, so it's like the last fifth of its tail is all like these small short ragged mats that form a thick blunt point, all suddenly after the other four-fifths of its tail was all just like the normal bushy fluff that you see on the tails of squirrels everywhere.

And, the matted part is an uneven dirty grey, while the rest of the tail is that greyish-red mix that the squirrels and the rabbits alike both have around here as their coats.