You should watch "Animal Face-off" on the Discovery Channel. Here is a link where you can match up some animals. My favorite episode has been Elephant vs. Rhino.
What an excellent website! Thanks for the link Garf. I must see this programme.
Just read this line and had to share:
"There are no two ways about it" he says. "An elephant would do whatever it wanted to a walrus.
Ach, I guess I'll just have to wait until the powers-that-be deign to show it in the UK.
I'd agree with you with the lion, by a whisker. From matching some of the animals up together against both lion and tiger, the lion with its superior mobility appears to hold sway.