My garden is plagued with grey squirrels nesting in nearby oak trees. Many generations of squirrels have come and gone in the time I have observed them, but I have never seen a dead squirrel (apart from road-kill !)

Where do the squirrely corpses go I wonder? Eaten by dogs or foxes maybe, but despite having a great desire to see the vermin giving sustenance to other animals, I have never witnessed them being eaten or decomposing.

Any suggestions as to where they go? 

We use to have resident eagles here...they take our squirrels if they are small enough, also our cats/rabbits...but of the most part people run over them with thier cars. Everyone we've had for years I've seen as road kill.  So they never live long enough to have babies for the most part. 

Hello Shirley, there are plenty of squirrels removed from circulation as road-kill here too, but that doesn't seem to do much in keeping the numbers down.

In most parts of England, the grey squirrel has caused the native red squirrel to become virtually extinct. Maybe we could do with some of your eagles here, provided they only want to take the grey squirrels. 

  And they are hardy little critters too, no wonder their numbers are high. On the way to work the other day there was a commotion high up in a tree I was walking past and the next thing I see is a squirrel freefalling from a great height ( lost his grip or shoved by another I do not know ) but as he hurtles towards the ground I could see it was quite relaxed and not struggling or anything. Anyway it hits the deck with a fair old thud that I could readily hear and quick as a flash it is up and running again and straight up the tree to continue whatever it was he was commotioning about in the first place.

               Apart from cars I reckon they must be bulletproof.