Hyenas may not attack humans for the following reasons:
1. Nature of hyenas: hyenas are social hunting dogs, usually living in a group composed of dozens of individuals. They usually attack only their prey, not other creatures, including humans. This is because of their nature and instinct, they will only attack those animals they think are prey.
2. The way humans get along with hyenas: In the wild, humans usually avoid the territory of hyenas and will not easily enter their living areas. In this way, hyenas will not feel threatened and will not attack humans. Of course, if humans invade the territory of hyenas or threaten them, hyenas may take aggressive actions.
3. Hyenas' cognition of humans: Hyenas' cognition of humans may be different from other animals. They may think that humans are different from other prey, rather than a potential threat. Therefore, they will not attack.
In general, the reason why hyenas do not attack humans may be due to their nature and instinct, the way humans get along with hyenas, and hyenas' cognition of humans.