The lions in Liberec zoo, here in the Czech Republic, killed one of the tigers after the doors between their enclosures weren't properly secured. In the tiger's defence, it was two-on-one. The lions were apparently outraged at years of getting second billing to the tigers simply because the tigers have white fur. Even the local hockey team is named after them:
The king of the jungle couldn't take that provocation for long. Personally I think they took it too far. Lions are all over the national ice hockey shirt, and the football shirt, for that matter. Couldn't they let the tigers have their day?
Maybe they're pissed off because the tiger logo looks all cool and snarling, while the lion logo is prancing about on its hindlegs sticking it's tongue out like it's just sat on a red hot poker, or something.