This is a P.S. to “In The Wild.” Thanks to the Smithsonian for the information and the photos. And I am quite pleased to learn they could chuff. Also for the explanation on how their limited vocalizations came to be.
Due to a different bone structure in their neck, the clouded leopard cannot roar like the larger cats, but also cannot purr because it lacks the fully ossified hyoid bone that allows small cats this ability. Vocalizations include growling, hissing and chuffing.
What is most interesting and very sad is that there was a quick flash of “Cloud Leopards For Sale” as I clicked through places to get the desired information. This in light of these lovely creatures being in danger and protected. It seems once more that the greed of the human species is unbounded.