Hey Polarbear, kind of looks like you have a cyber library, of animals gone wild,
Anyway, this photo kind of reminds me of one of Aesop's fables,
to para-phrase;
The bottom two animals were simply helping out the animals behind them by letting them rest, thier tired front legs on the animals in front of them.
Moral of the story;
sometimes, while your trying to help someone out, you may end up taking it up the a$$.