how can humans know what dinosaurs diet was based on only taking a view to their bones?
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Well, for one thing not just bones fossilize. We’ve had a number of cases where we found remnants of what they ate inside the fossils of the overall bodies. Fossilized poop, too.
A lot of it is also their teeth, though.
We look at the shape of their teeth, look at modern animals with similar teeth and what they eat and make educated guesses from there. Similar idea for height and body posture giving clues for what they could comfortably reach and whether they seem designed to eat “up” off of shrubs/trees or down to graze, whether a predators teeth are designed for taking out big chunks which points to big game or catching and holding which points more to smaller stuff they can grab and eat whole vs needing to wound and then bite apart, things like that.
We don’t “know” nearly as many things as we have educated guesses about and the field changes or updates prior theories regularly.
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