That really depends how you measure and define intelligence and does a disservice to them.

Toddlers for example dont tend to have gang wars for territories and certainly couldnt do battle outcome predictions from a glance at a group across thick canopy and the sounds of branches and hollering.

Please quote your sources regarding monkey and ape intelligence with regards dead ends (whatever that means), wet blanket.

Please also note you are just a wet blanket and not the wet blanket - that epithet is not normally sought after.

well that surely seems to be empirically true...

Apes tend to be way more intelligent than humans of any age about how to hold and consume different vegetables and fruits.