Birds that learn songs have a clump of fifty extra-active genes. We language-loving humans have the same active clump. Primates that don't talk and birds that don't learn songs have a lot less going on in that gene nexus.
This finding comes from sequencing the entire genome of 48 species of bird, Dr. Jarvis of Duke University being the lead investigator in a flurry of papers published this week. Sourced from Science Daily News.