Cryptoprocta ferox has several features similar to the Felidae. The dentition is characteristic of advanced carnivores - the carnassials are enlarged and there is one reduced upper molar. The skull has a shortened braincase and enlarged orbits (Ewer 1973).
The anal scent glands produce a pungent odour when the animal is aggravated (Nowak, 2005).Cryptoprocta ferox also has chest glands that fully develop upon sexual maturity. They are larger in males and secretions are more active during the breeding season (Ewer, 1973).See video footage of the fossa scent marking on the Arkive website.
Cryptoprocta ferox is plantigrade and the retractile claws are short, sharp and curved (Nowak, 2005).See video footage of the fossa grooming on the Arkive website.
The fur is short, dense, soft and usually red-brown but occasionally black.Malagasy people originally thought this variation represented different species but it is more widely accepted that the colouration is melanistic.The vibrissae (whiskers) are especially pronounced and are as long as the head (Kohncke, 1986), (Nowak, 2005).
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