How to tell between cannibalistic or not?

[Sharktopus]

Hello, everyone. I was wondering, how can you tell the difference between a cannibalistic axolotl and a non-cannibalistic axolotl, just by looking at them? I've heard that there are differences in their teeth/head shapes, but I can't seem to find any good pictures comparing the two.

Edit: Nevermind, I've found a useful thread on this forum after giving it another look. This thread can probably be deleted, if that's how this forum operates