Animal behaviour: Elephants are capable of vocal learning

J. H. Poole, P. L. Tyack, A. S. Stoeger-Horwath, S. Watwood Nature 434, 455–456 doi:10.1038/434455a (2005)

The African elephant Calimero spent 18 years with two Asian elephants at Bioparco in Rome, Italy, not the Basel Zoo, Switzerland. He was later transferred to Basel, where the recordings described in this Brief Communication were made.