It is a small animal about 11 inches high the shoulder. About 3.5 feet long with about 1/3 of the length being the tail.
Puma yagouaroundi is a rather odd looking cat, a small flattened head, small ears, and an elongated body. The short, smooth, unmarked coat shows three distinct colour phases: black, brownish grey, and a reddish brown phase known as the Eyra. Typically, the darker colors occur in the rainforests while lighter color are present in the drier environments.
Depending on the source you read they are either a very secretive cat so it's been a challenge to learn a lot about them OR they are seen so often that much is known..It's hard to know who is accurate, I suspect it is due to which population is being studied.
They have been spotted in pairs, and yet known to live solitary lives as well. They make 13 distinct calls.
They are mostly threatened by habitat destruction and human encroachment, and are listed as of least concern for being threatened. Though the Gulf Coast species is known to be on the decline due to habitat loss and conflicts with people (road kill, trapping and poultry thieves)
Sources:
Biodiversity Warriors. Wild Cat Conservation. ADW. Arkive. BCR. ISEC.