Perhaps we are not the only animals who use language. Dr. Terrence Deacon, a neuroscientist at the University of California, Berkeley, who also is an expert in animal communication, notes, "I don't see a fundamental white line that distinguishes us from other animals." Only time and research will tell if we're alone in the language arena. For now it's a good idea to keep the door wide open.
Cultural hitchhiking: Was there a "sponging Eve"?
Am informative summary of the research on the genetics of tool use in dolphins living in Shark Bay in Western Australia can be found in an article called "Cultural hitchhiking: How social behavior can affect genetic makeup in dolphins." It turns out that the culturally transmitted use of sponges -- called vertical social transmission -- can actually "shape the genetic makeup" of wild dolphins. Dolphins, who live deep in the bay, show mitochondrial DNA (mtDNA) types called Haplotype E or Haplotype F that are inherited solely from the mother, whereas non-sponging dolphins who live in shallower water mainly show Haplotype H. All of the 22 sponging dolphins who were observed turned out to be members of one matriline and were Haplotype E.