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Guianan Squirrel Monkey (Saimiri sciureus) (c) SaritaWolf - please do not repost

#Mammalia #Primates #Haplorhini #Platyrrhini #Cebidae #Saimiri #least concern #ex situ

Fossa (Cryptoprocta ferox) - (c) SaritaWolf - please do not repost

#Mammalia #Carnivora #Feliformia #Herpestoidea #Eupleridae #Cryptoprocta #vulnerable #ex situ

Spectacled Bear cubs (Tremarctos ornatus) - (c) SaritaWolf - please do not repost

#Mammalia #Carnivora #Caniformia #Ursidae #Tremarctos #vulnerable #ex situ #Baby Animals

Muddy Run Pow Wow - September 2025 - (c) SaritaWolf - please do not repost

#Mammalia #Primates #Haplorhini #Catarrhini #Hominidae #Hominini #Homo

🐾 On the structure and development of the skull in the mammalia /. London: Royal Society of London, 1874-1885. Original source Image description: Historical scientific illustration showing detailed anatomical views of mammalian skull structures from different angles and cross-sections. Various parts of the skull are labeled with letters and numbers, highlighting bone formations and internal features in shades of beige and yellow. The drawings emphasize the structure and development of the skull in the mammalia, with careful shading and texture to distinguish bone density and openings. The image includes dorsal, ventral, and lateral views, focusing on the arrangement and connection of skull bones, such as the cranium and jaw, revealing intricate details of bone morphology.

#nature #illustration #Mammalia

1st of July 2026: Crescent Nail-tailed Wallaby

We’re beginning the new month with an extinct animal, the Crescent Nail-tailed Wallaby (Onychogalea lunata), or Tjawalpa or Waurong to the aboriginal people of the area. They’re a species of marsupial who used to be widely spread across south-western Australia, but now, well, nowhere [1].

They were approximately half a metre in length (including tail) and had soft fur of moderate length [2]. They inhabited open, arid woodlands. Aboriginal people report that while they were widespread across habitats, including stony hills, they were especially common in mulga habitats [1], which are areas dominated by Acacia aneura and perhaps featuring eucalypts [3].

They enjoyed sunning themselves, though as prey animals would be quick to take off once danger seemed to approach, running to hollow logs. They didn’t build nests, but rather would make hollows in soft ground under trees where they could lie during the heat [2]. They were hunted by native predators (such as the Western Quoll (Dasyurus geoffroii) or the Tasmanian Devil (Sarcophilus harrisii)), as indicated by their bones being found in Orchestra Shell Cave, marked by gnawing [4].

There have been no reliable sightings of them since the 1940s, and several models between 1993 and 2012 have concluded that there is an over 90% chance that they are extinct at this point, placing the date of extinction around 1963. Their extinction was likely driven by invasive predator species, specifically the Red Fox (Vulpes vulpes) and feral cat (Felis catus). Habitat degradation due to sheep farming also likely did not help [1].

Sources: [1] [2] [3] [4] [Image]