A recent study suggests that early mammals' success was linked to their "killer instinct.
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Researchers found that the first big land predators needed to become better hunters to thrive. These early mammal ancestors ruled the Earth for around 60 million years, even before dinosaurs appeared. This study sheds light on how our ancient ancestors evolved.
Scientists looked at the jaw and body size of ancient meat-eating mammals, known as carnivorous synapsids. By studying these features, they figured out how these predators hunted and survived in their environments. They found that about 270 million years ago,
there was a big change in the way synapsids' jaws worked, which coincided with a shift towards more predatory behavior. Plant-eating mammals grew larger and faster, while meat-eaters evolved to become more skilled hunters to stay alive.
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