I've also heard the stories of Reds castrating other squirrels, and always thought it to be "old hunters tales." Then last fall, while sitting in the woods, a buddy and I saw a Red sneak up behind a grey. It sure as heck looked like he tried to bite his wedding vegetables off.
Up here, Red squirrels are often referred to as pine squirrels, and some folks call Fox Squirrels, "red squirrels." It can get a bit confusing in conversation
As a kid, we saw lots of Fox Squirrels around, and as warbirdlover mentioned they are the tasiest. It's pretty rare to see Foxys nowadays, but the few that are on the farm are as big as cats. Seems they tend to stick close to the edges of fields.
We will still be treating the Red Devils as targets of opportunity