Here's why:
* Genetics: Fur color in bears, like in most animals, is determined by genes. These genes control the production of pigments (like melanin) that give fur its color.
* Variations: While brown is a common fur color in bears, there are variations. Some bear species (like polar bears) have white fur due to different genes, while others might have black or even reddish-brown fur.
* Passing Down: These genes are passed down from parents to offspring, so if both parents carry the genes for brown fur, their cubs are likely to inherit that trait.
However, it's important to remember that:
* Environment can play a role: While genetics are the primary driver, factors like diet and sunlight exposure can slightly influence fur color.
* Not all bears are brown: As mentioned above, there are many different bear species and color variations.
So, while brown fur is a common inherited trait in bears, it's not the only one.