During the dinosaur age, some were just massive. Why are modern land mammals, and others so tiny. Comparing a modern tiger to a sabertooth is no contest.
In: Biology
First of all, you mention sabertooth, but those did not exist during the time of the dinosaurs. You are conflating two very distant time periods, I assume you’re in part thinking of the last ice age.
At the end of the last ice age about 15,000 years ago, there was a large extinction event, where a lot of large mammal species went extinct. Large creatures take the most food to support themselves, so they’re usually the first to start suffering during a planetary crisis. There’s a lot of theorizing about exactly why this extinction happened, the common consensus is that both climbing temperatures, and overhunting of the land by early humans, were involved.
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