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. 2009 May 15:163–205. doi: 10.1016/B978-1-4160-0009-9.50011-6

Figure 4-6.

Figure 4-6

Bottle brush tail. Piloerection in the form of a frizzed-out tail may be a sign of anger or excitement, either fearful or joyous. During a display of anger the puffed tail is usually accompanied by an arched back and a vocal hiss or screech. If the display represents excitement and joy, the tail may fuzz out and flick back and forth.

(Courtesy Lisa Leidig.)