One of the Triassic's most bizarre animals, Thrinaxodon, also called the Cynodont, is a missing link between reptiles and mammals.
— Allen, describing Cynodont
in Birth of a New Blood

Thrinaxodon (name meaning "Trident Tooth") is a genus of cynodont that originated during the Permian Era in what is now South Africa and Antarctica. Only the size of the fox, this animal was a cross between a mammal and reptile.

In the Series 2 Premiere Birth of a New Blood, a pair of Thrinaxodon were brought back to the park. They reside in the Underground Mansion.

Facts Edit

Era & Discovery Edit

Thrinaxodon lived during the Permian to Late Triassic Period, 270 – 220 million years ago. It was constantly bothered by dinosaurs, like Coelophysis.

Physical Attributes Edit

Thrinaxodon was a very close relative to mammals. These animals grew up to half a meter long. Despite being reptile-like, Thrinaxodon was a synapsid and had more mammalian features.

One of the most bizarre creatures of the Triassic, Thrinaxodon was a missing link between reptiles and mammals. When they ran, their back-bone moved from one side to another like a reptile's. However, they had fur and lived down a burrow like a mammal.

Behavior & Traits Edit

Like most small mammals, these animals probably lived in underground burrows and often slept on a bed of lichen. The bond between Thrinaxodons was extraordinarily strong; when a male and female mated, they would pair for life.

Like most reptiles, female Thrinaxodons laid eggs. However, once they hatched, the young were completely dependent on their parents and spent their first three months feeding from special milk glands on the mother’s stomach. Even though these animals were oviparous, females produced milk for their young. While the mother lets her cubs suckle her, the father would carry out "domestic house chores", like changing the bedding of the burrow.

The males only hunted during the night and possibly their most common prey were baby dinosaurs. That was a time when most of the larger predators were asleep. Thrinaxodon hunted small animals, including young dinosaurs. After killing its prey, it would return to its burrow with the food and would feed it to the rest of its family.

Journal Entry Edit

Cynodonts are bizarre, Triassic creatures that are the missing link between reptilian animals and mammalian lifeforms. When running, their back bones move from one side to the other, like a lizard. But because that of their mammal-like appearance as well, they have fur and live down burrows like mammals.

As it turns out, they pair for life. As another part of their reptile-mammal-hybrid nature, the females lay eggs, but when they are born, the young feed off of their mothers milk. The males only hunt at night whereas the females stay in the burrows and sleep on a bed of lichen.

— Allen, in his Journal, about Cynodont


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