Rigo, the Melbourne Zoo's beloved 42-year-old western lowland gorilla, has died as a result of hypertrophic cardiomyopathy, according to tissue samples collected during his autopsy. Heart trouble is common in captive, older gorillas, and a U.S. group is studying cardiac-related mortality in the species. Rigo's cardiac ultrasounds in 2007 and 2009 were normal and he didn't exhibit any overt symptoms of disease, according to Melbourne Zoo veterinarian Michael Lynch.

Related Summaries