has been considered to represent a very primitive ancestor of modern mammals,‭ ‬though it is not a mammal in itself.‭ ‬This means that there are many unanswered questions about this little creature,‭ ‬specifically concerning the biology of the metabolism and exactly how much like a true mammal it really was.‭ ‬As a living creature the small size of Hadrocodium would have been its best defence against the larger dinosaurian predators of the Jurassic,‭ ‬since it could spend its time scurrying around the forest floor under cover as it hunted for insects to eat.

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