In the barnyard ... of course ... this is what's called "artificial selection" ... we select for the best wool ... or mutton ... ask the farmer and usually they'll be glad to tell you about about what they're selecting for ...
Reproductive capacities is what nature selects for ... not intelligence ... the mutation that allows better reproduction need only occur once, after so many generations this mutation will dominate the entire population ... and we're clear how this happens on the molecular level ... how DNA unzips and mRNA forms against the exposed surfaces, how tRNA brings in amino acid units and strings them together as proteins ... including reproductive hormones ...
Evolution is just a theory ... a hypothesis ... a belief system designed to make money ... a scientific way to make better wool ...