The Case of the Curious Coconut

I was out at the back of the house and found the strangest thing. There is a coconut (I think that is what it is) sitting on the water drain grill.

What is weird is that there are no palm trees or trees with this kind of nut anywhere around the area. No trees up on my neighbor's property where it might just fall down on to mine. And what else is strange is the odd location it has been neatly placed. R and I figure someone or something (an animal?) must have brought the coconut here.