Trex sounds

[Popping Mad]

https://www.youtube.com/watch?v=r6HZu2RlAqg

I don't know who did this. I found it when looking up Mark Nowell
lectures on youtube. But it made me ask how it is know with certainty
that T-Rex had no syrinx?

[John Harshman]

It isn't known with certainly, and in fact it's a fairly weak inference.
The first fossil evidence of a syrinx is Vegavis, and the claim is that
if there had been anything much older we should have found at least a
few by now.