Linda, in my whole life, I have NEVER seen a squirrel eat grass EXCEPT this one. We don't see any of our others eating grass. How can we tell it's this one? Look at it's tail there on the bird bath -- it's sort of a strawberry blonde --- it's the only one with this odd colored tail so that's how we know this one from the others. Now, I did see, just recently, a "baby" with red tail (what we call the grass eater) eating grass around the bird bath so I'm just guessing it's red tails baby & the baby is learning from the mom.
Only time will tell. If the baby lives to grow up & it is a grass eater too, then......
We've also speculated that it's tail is the result of grass eating. Who knows? Yes, we joke about it being a quirky eater too.