Quarantine entry #98 - June 27

Obligatory disclaimer: real life sucks, however, let us talk about something else again. No, not about ‘Force of Nature’, a new Mel Gibson movie – that we will talk about separately; let us talk about… what?

I admit that I wanted to talk about the king vulture for today – we have discussed the New World vultures in general and the American black vulture in particular in the past, when something else came up: the Thylacosmilus.

In case you forgot, the Thylacosmilus was a prehistoric sabre-toothed mammal, and it was a marsupial, meaning that it was more closely related to the modern koalas and kangaroos than to the big cats, dogs, bears and so on. I also must admit that my perception of the Thylacosmilus is influenced by Mauricio Anton’s ‘Sabretooth’ book, but what else is there? Donald R. Prothero’s ‘Princeton Guide’? Yes, no, I will pass.

Back to the Thylacosmilus for real. People like Mauricio Anton and his sources had depicted the marsupial sabretooth, (aka Thylacosmilus and its’ closest extinct kin), as, well, a marsupial sabretooth, a marsupial counterpart to the placental sabre-toothed carnivores, (and there were quite a lot); right now, it is the word ‘carnivores’ that is key. The recent studies have implied that the Thylacosmilus had a different lifestyle from other sabre-toothed mammals, such as Smilodon, and used its’ sabre-shaped teeth in a different way; already there are theories that it might have been an insectivore instead – but how possible is that?

Let us look at the modern mammals. Recently, we have talked about bears in general, including the sloth bear. While the giant panda is an obligate herbivore, and the polar bear is an obligate carnivore, the sloth bear may be the most specialized bear of them all, as it feeds almost completely on ants, termites, and the like. As a result, on one hand, it got powerful front legs and mighty claws, and on the other, it got a specialized muzzle and reduced teeth, but it can bite, and its’ canine teeth are especially well developed. Pause.

Now, let us look at the Thylacosmilus. Its’ paws and claws were more bear- than cat-like, with claws that were only semi-retractable and not as sharp as those of true cats, and its’ forepaws were powerful, but then again, this is a trait shared by all the sabre-toothed carnivores, including, the mammal-like reptiles, maybe. Its’ muzzle, however, is blunt, not long as that of the sloth bear. So-?

So nothing, let us look at the aardwolf as well. Despite its’ name, it is no relative of the aardvark, but of the hyenas, and in fact it looks like a small striped hyena on the outside. On the inside, however, it is no scavenger or grave robber, but rather feeds on social insects, termites and ants. Not unlike the sloth bear, it too has reduced teeth, but notable canine teeth for self-defence… and nothing else that would imply that it was an insectivore, rather than a carnivore, as the rest of the hyena family is. Thylacosmilus could have been like this as well. Anything else?

Sadly, no, but the carnivorous marsupials are a confusing group, as paleontologists are still unable to properly agree as to what and how they looked like, let alone their paleoecology. What else?

Let us get back to the king vulture, maybe? Well, these birds have appeared on the planet during the mid-Pliocene, when the last marsupial sabretooths were still living there, so the two might have met back then. However, the fossil remains of the king vulture from that period are scarce, so it is hard to say. What is known, however, that this bird is most closely related to the Andean condor out of the entire New World vulture family, and after the two species of condor, it is the biggest of the New World vultures; certainly the most colorful. An imposing bird, the adult king vulture has predominantly white plumage, which has a slight rose-yellow tinge to it. In stark contrast, the wing coverts, flight feathers and tail are dark grey to black, as is the prominent thick neck ruff. The head and neck are devoid of feathers, the skin shades of red and purple on the head, vivid orange on the neck and yellow on the throat. On the head, the skin is wrinkled and folded, and there is a highly noticeable irregular golden crest attached on the cere above its orange and black bill; this caruncle does not fully form until the bird's fourth year. A true king of the vultures, in fact. Anything else?

…For the moment, the king vulture is classified as ‘Least Concern’, as opposed to the Andean condor, which is ‘Near Threatened’ and the California condor, which is ‘Critically Endangered’; hopefully, this trend will continue, and the king vulture will remain flourishing for ages to come, and not vanish from the face of the planet as the various sabre-toothed mammalian carnivores did.

…This is it for now; see you all soon!