text: Ravens could not enroll at coursera.org and get great on-line courses from first-rate colleges free (or $50 for a certificate), yet they might benefit from computer-aided learning if scientists created videos sharing raven sounds recorded elsewhere. Ravens down south haven't got nearly as good of a vocabulary as Alaska ravens. The strangest thing is that younger ravens sometimes meow along the waters edge hidden in bushes fooling people rather well. One might confuse the sound with a quiet cougar, maybe..