Well, this is not a too great shot...but the title should show the meaning.
I saw this little kitten when I were on vacation in Greeze. it was the size of my hand, skinny, and looked very weak. Despite all this, the little fellow managed to 'cathc' some food that fell of a table, and even managed to keep it even though other grown-up cats tried to take it away from him.
I'm not sure if this little one survived, but I believe he did.
That's Survival Of The Fittest, if you ask me.