Just a friendly reminder:

https://e621.net/wiki/show?title=cub

While most cubs are quite young (4-10, in human years), the phrase cub can refer to all physically immature and legally underage characters, ranging from infants, to teenagers.

This tag also applies to all ratings. It is imperative that all underaged characters are tagged appropriately, as many people do not wish to see explicit cub artwork. Please err on the side of caution and tag cub even if you suspect they might be 'of age,' but are not sure.