Refers specifically to the North American brown bear subspecies. Often used in the full form ハイイログマ (灰色熊) in more formal or descriptive contexts.
See also: ハイイログマ
The grizzly is a large bear that lives in North America.
キャンプ中にグリズリーに遭遇しないように気をつけて。
Be careful not to encounter a grizzly while camping.