There are crocodiles in the river and other predators waiting elsewhere. Unbeknownst to Maralee Park, there was a lioness hiding in the tall grass waiting for the right moment to attack. It happened so fast that Maralee Park didn't see it right away, but in the action happened in front of them - a lioness attacked one of the wildebeest. After a few minutes, Maralee Park's ranger moved the vehicle a little closer. The lioness actually killed at least 2, maybe 3 wildebeest while they were there.