You find yourself walking in the countryside eating a piece of fruit and when you're finished you can see no bins around to get rid of the core or the peel. You think about putting it in your pocket, maybe wrapping it in some old tissue and then you realize - "Hey, I'm in the countryside. This is biodegradable" and you toss it under the nearest tree for some small woodland creature to feast upon. In the absence of said small woodland creature, the fruit will just simply decompose and return nutrients to the earth and support a new generation of growth.
But here's a question. Is this considered littering?