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King of Beasts: Lions are the top predator in the game, and can send most mammals running away from them. Having too many lions is a bad thing, as you can really upset the balance in your park.
Nigh-Invulnerability: Likely that if you have an over-predatoring problem and let all the animals die out, rhinos will be the only things left in their park. They're possibly the only animal that lions are absolutely no threat to.
Stop Helping Me!: The advisers are all good if you're playing the game the traditional way, but if you set out for a park with a theme, they can be rather annoying when you go to check your Park Census and Population Graphs.