"Unkind Conversations" by Larry Vienneau. The raven is a vocal virtuoso. The world’s largest song bird, raven blends a unique rendition of quaffs, yelps, trills, thumps, chucks, trumpets and rattles. Vocal variety is what distinguishes the raven’s language from all the animal kingdom except man. They communicate danger, opportunities,etc, and are great mimics.They have intense conversations and sometimes vocalize for the sheer joy of expression.