[Excavator]

More accurate spatial reasoning could also be due to the need to navigate a complex environment, such as during hunting.

It could also be due to males having larger brains.

[Retric]

Or to break out of the survival aspects, dance may have been important from an evolutionary standpoint.

IMO, the point is there are reasonable priors to actually start testing.

Some of these tests may be fairly simple. Do male baby's throw more things than female baby's?