Although this girl seems to be doing just fine riding this ostrich, ostriches are known to be rather aggressive and their powerful kicks have been deadly. They're also fast runners, which doesn't help if you're getting chased.
Even snake handlers get bit, so why should you risk owning one of these? The black mamba (pictured here), is the most venomous snake in the world and is responsible for a large number of human deaths a year. Before an anti-venom was established, their bites were capable of killing a human in 20 minutes. Skip the ego-boost of owning "the world's deadliest snake," since it could actually kill you.