Needs a workable definition of “smart” and a way to measure it across species. Without that the question has no meaning. Also chimps cannot “speak human.” I th

Needs a workable definition of “smart” and a way to measure it across species. Without that the question has no meaning. Also chimps cannot “speak human.” I think you misunderstand and exaggerate the attempts to teach human language to chimps. Humans cannot “speak chimp” because chimps have no language for us to learn, at least not a language comparable to human language. People have learned to understand the vocalizations, facial expressions, and body language of chimps. Humans can grunt and scream and grimace just like chimps and we understand each other at that level.