A tail is the caudal appendage of some beast, bird, or monster, used as a separate charge in its own right. The type of creature must be specified in the blazon; period armory has examples of lion’s tails (in the arms of Pynchebek, c.1460 [RH]) and fox’s tails (the badge of Thomas of Woodstock, d.1397 [HB 104]). Society armory has examples of dragon’s tails and yak’s tails, among others. Tails are palewise and erased by default; while most tails (notably lions’ queues) have the severed end to base, other tails (such as the fox’s tail) must be explicitly blazoned.
The term “queue” refers specifically to a lion’s tail. It may be “fourchy” (forked), or “nowed” (knotted), just as though attached to the lion. The illustration shows a lion’s queue and a fox’s tail couped, tip to base. See also ermine spot.
Shag Fevermore bears: Pean, a lion’s tail queue-fourchy erect Or.
Victoria Fox bears: Purpure, on a bend sinister argent between a pair of hands Or, three fox’s tails palewise, tips to base proper.