Question

What do you think cranial capacity is a good indicator of?

Answer 1

@jagr2713

Answer 2

Cranial capacity is how much space there is inside the skull.

That's a good indicator of how big the brain is...and brain size has something to do with how smart an animal is.

NOTE!!!!!
This doesn't mean "my head is 5% bigger than yours, therefore I'm 5% smarter" - it doesn't really work that way. But if an entire species X has a bigger average brain size than species Y, and their brain structure is generally similar, then species X probably has higher potential intelligence