You're right, but that doesn't fit in a snarky one-liner. If we were serious about this bone mass minimum, we'd need to consider why there are fossils of small

You're right, but that doesn't fit in a snarky one-liner. If we were serious about this bone mass minimum, we'd need to consider why there are fossils of smaller animals, or big but hollow-boned animals. That's a rabbit hole with many hypothetical variables.