Feb 2
The GABI from the perspective of some terror birds
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The GABI from the perspective of some terror birds
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Lazy drawing of a miacid Vulpavus. Miacoids were basal carnivorans, and probably ancestors of all living carnivorans. Which makes this guy a (many, many times) great-grand-uncle of cats and dogs*.
Vulpavus lived during the early to middle Eocene in what today is North America. It was a rather small (weighting between 3.9 and 6.6kg), arboreal predator. It seems that at least some Vulpavus species could hunt prey close to them in size: there’s direct evidence, in the form of tooth-marks left on the skull, that Vulpavus hunted an early primate Notharctus (about 4kg), belonging to the stepsirrhini suborder (which includes extant lemuriforms).
All restorations of this guy I saw showed him with kind of weasel-like, short fur. I wanted to make him more fluffy, so here he is. Fluffy Vulpavus. At first I was wondering whether the amount of fluff made sense, considering the Eocene temperatures, but then I remembered that today, there certainly are surprisingly fluffy creatures, living in surprisingly hot places, so I just rolled with it.
Here’s also an equally lazy gif showing how I got from a skull to the fleshed-out creature:
Sources: (x),(x)
“Anhinga fraileyi feeding on Phractocephalus nassi”
In this reconstruction, Anhinga fraileyi is depicted as more robust than the modern Anhinga anhinga, with a proportionally larger and stronger bill. The skull is interpreted with the eyes positioned closer together and more frontally oriented, resulting in partial binocular vision. This eye placement, somewhat comparable to that of owls, may have provided improved depth perception and prey detection in the turbid waters of the Pebas system.
Phractocephalus nassi is interpreted as a distant relative of modern catfishes (Siluriformes), but significantly more robust in overall build. The head is reconstructed with a broad, flat, and heavily ornamented frontal region, consistent with the known cranial morphology of the species.
The pectoral fins, equipped with strong spines, likely functioned as an effective defense against large predators, while the caudal fin would have provided powerful bursts of acceleration rather than sustained high-speed swimming. Overall, Phractocephalus nassi is interpreted as a dominant fish within its ecological niche, inhabiting deep channels, lagoons, and the margins of slow-moving rivers.
This reconstruction is theoretical and based on anatomical inference and ecological reasoning. No direct soft-tissue evidence exists, and the interpretation represents a personal hypothesis about how these animals may have appeared in life.
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I've decided to do a "remake" of all my drawings of the Pebas system fauna. Here is the Stirtonia
Kaua'i'ō 'ō
Vulpavus was a genus of Miacid that existed 34 million years ago. It is a likely ancestor to all of the order Carnivora. Likely arboreal, Vulpavus would have hunted similarly to cats today-- pretty much anything smaller than itself. This early arboreal lifestyle is important in regards to Carnivorans to come. In order to safely scale trees, Miacids had to evolve wrist bones that allowed them to rotate their paws. While most of Carnivora stick to the ground nowadays, this feature gave them an edge over their early competitors, the Creodonts. Creodonts could not move their wrists in such a fashion, and were limited to using their jaws for hunting (hence their large skulls) while the Carnivorans who moved in were given the opportunity for more varied hunting strategies. As commonly seen in arboreal animals and their descendants (just look at us!), Carnivorans also have larger brains. While Canids seem to have "reverted" back to the use of jaws for hunting, they are able to run more efficiently on their small paws, and their added brain power lets them make up for their smaller jaws through pack hunting (something Creodonts were much too dull for). Dogs who don't hunt in packs tend to either take carrion or small prey like rabbits (compare prey selection of pack hunting wolves and solitary or pair hunting coyotes). Cats, however use their paws for hunting, which enables them to take down prey larger than themselves, even the solitary cats like tigers.