Feline Feeding

My cat has a very weird strategy when it comes to food.

I feed him in the morning - generally right before I go to work - and then leave him to it, confident in the knowledge that I've given him about enough so that he'll finish it mid-afternoon, and just be starting to get hungry again by the time I get home.
And I calculate it fairly well, for the most part.

But mostly, when I get home, there's still some food left in his bowl.

And it's not that he's not hungry - because the moment I walk through the door, he races to his bowl, finishes the last bits, and starts meowing piteously for more, because I'm STARVING, Mummy, don't you understand?, and he eats his way quickly through the next lot too.

It's odd, really.
It's almost as if he's decided that, every time I go out the door, I might not come back through it again. And he'd better wait, and save up that last morsel of food, just in case it has to last him for the several weeks it'll take before he successfully breaks down my front door and learns to hunt in the wild...