When Horror Struck the Hammock

Take a look at this idyllic scene from only a couple months ago:

And now I present a photo of that very same hammock, today (sensitive readers should consider looking away): 

 

Where is it, you might be asking? Oh. Well, it's at the very bottom of the photo... on the ground. Chewed to shreds. By squirrels.

In the past I was a friend, nay, a champion, of our four-legged furry-tailed friends. Between this hammock carnage and the mysterious "invisible hummingbird invasion" of 2011... well sirs, I say to you: no longer! 

What on earth would possess an animal that ends up as a mascot on various children's products because of its "loveable" and "furry" nature, to completely decimate an unsuspecting human's hammock (and a Father's Day gift at that) after ignoring it all summer?

Is it bizarre autumnal nesting behavior, or merely the true colors of a descipable and soulless rodent appearing? I'll let you decide, only not really because it's obviously the latter.