Today, scientists have uncovered a remarkable discovery: fossilized skulls of an extinct animal with the first known evidence of blood. This animal, called Kaprosuchus saharicus, lived approximately 95 million years ago in what is now North Africa. The fossilized skulls were found in Morocco, and have provided researchers with an unprecedented look into the evolution of modern-day mammals. The unique feature of this fossil is that it contains traces of hemoglobin, a protein found in red blood cells, which suggests that it was a warm-blooded animal. This finding is groundbreaking, as it suggests that the evolution of warm-bloodedness predates the first known mammals by nearly 40 million years. This discovery could help scientists better understand the evolution of modern-day mammals, and how some species have become adapted to cold environments.

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source: Phys.org