Therocephalian

“Therocephalians” had some early mammal-like characteristics, including fur and whiskers. Some species were even warm-blooded. These creatures had pit-and-grooved teeth, suggesting a venom gland, making “therocephalians” the earliest known venomous vertebrates. The “therocephalians” (“beast-heads”) are named after their large skulls.

Therocephalian
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