The term is also used to describe the heavy armour of the armadillo and the extinct `` Glyptodon '' , and is occasionally used as an alternative to scales in describing snakes or certain fishes , such as sturgeons , shad , herring , and menhaden .
The term is also used to describe the heavy armour of the armadillo and the extinct glyptodon , and is occasionally used as an alternative to scales in describing snakes or certain fish , such as sturgeon .