Here's why:
* Survival instinct: Like any animal, Siberian tigers have a strong survival instinct. They are aware of potential threats and dangers, and fear can be a powerful motivator for avoiding them.
* Unfamiliar situations: While they are powerful and capable hunters, tigers might be cautious and hesitant in unfamiliar environments or when encountering something new or unexpected.
* Social interactions: Tigers are solitary animals, but they do have a hierarchy within their territories. They might show fear or submission towards a larger, dominant tiger.
* Individual personality: Just like humans, each Siberian tiger has its own personality. Some might be more bold and fearless, while others might be more cautious and easily startled.
Important note: It's crucial to remember that wild animals are unpredictable, and approaching a Siberian tiger is extremely dangerous. Even a "scared" tiger can be extremely powerful and potentially deadly.