Nature 430: 6999 29 July 2004 Brief Communications Animal communication: Ground squirrel uses ultrasonic alarms 523 DAVID R. WILSON AND JAMES F. HARE This rodent emits a high-frequency shriek as a warning that is inaudible to predators. doi:10.1038/430523a
================================= XIAO Jianqiang Institute of Hydrobiology The Chinese Academy of Sciences Wuhan, Hubei, 430072 China [EMAIL PROTECTED], [EMAIL PROTECTED] =================================
