Here's why:
* Genetic Influence: While the basic stripe pattern is inherited from their parents, the exact configuration and arrangement of the stripes are determined by a complex interplay of genes.
* Environmental Factors: The environment in which a tiger grows up can also influence its stripes. For example, tigers living in areas with dense vegetation may have more broken or irregular stripes compared to tigers in open areas.
* Individual Variation: Just like human siblings, even within a litter of tiger cubs, each one will have a distinct stripe pattern.
So, while all tigers have stripes, each one's pattern is like a signature, making it easily distinguishable from other tigers.