Here's a breakdown:
* Brown bear (Ursus arctos): This is the broad species encompassing various subspecies.
* Grizzly bear (Ursus arctos horribilis): This is a specific subspecies of brown bear found in North America.
While the terms are often used interchangeably, technically, grizzly bears are a type of brown bear. The main differences between them are:
* Geographic location: Grizzly bears are found in North America, while brown bears are found in Europe, Asia, and North America.
* Physical characteristics: Grizzly bears tend to have a hump on their shoulders and a lighter fur color than some brown bears.
However, it's important to remember that these are general distinctions, and there's a lot of overlap in appearance and behavior between different brown bear subspecies.