[mewzilla]

The partial Koleken skeleton retrieved from La Colonia Formation included several skull bones, almost all of its back bones, a complete hip, some tail bones, and two almost-complete legs.

How do they infer vestigial arms from that assemblage...?

[Red Badger]

Good question..................

[Does so]

“How do they infer vestigial arms from that assemblage...?”

I suspect scientists have other KNOWN T. rex samples wherein muscle insertions on nearby bones can be measured. The size and placement can direct a researcher to a reasonable hypothesis.

Comparing KNOWNS is a well-known technique in science and why scientists keep collections.

Forensic anthropologists can observe features of human skulls and pelvises to put a sex, an age, and the person’s race to an unidentified skeleton.

[Salamander]

They found tiny little bracelets nearby.