CAROLYN A. MCKEONE / SCIENCE PHOTO LIBRARY CAROLYN A. MCKEONE / SCIENCE PHOTO LIBRARY
Cat hissing. Calico household cat (Felis catus) hissing. When threatened, a domestic cat hisses and arches its back to make itself seem larger to opponents. This cat is calico or tortoiseshell in colour, which arose as a genetic mutation in the originally greyish-brown domestic cat. Cats of this colour are almost always female.
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