It is evening, the time that zebras disappear.
As the sun goes down in the Serengeti, many animals are finding a safe place to roll up and hide for the night, while others are just waking up and are looking forward to the cover of darkness. Whether you are an animal hunting or being hunted, or a person listening to the sounds of the night, the Serengeti becomes a different place when darkness falls.
During the day, good eyesight and herding behavior protects many of the large herbivores including zebra, wildebeest, and other gazelles from their predators. The night is the time for these predators such as hyenas, lions, and leopards to hunt their prey.
Night-time is also the time when many smaller "Night Animals" come out, ones that are eaten by raptors or other daytime predators.