Authorities said Ricko, a 25-year-old eastern black rhino, died Friday at the Lincoln Park Zoo.
“It is with deep sadness that we share the loss of Ricko,” the zoo said in a statement on Facebook. “Ricko presented with acute illness, and despite intensive treatment and supportive care provided by veterinary and animal care personnel, he died on April 8.”
Ricko came to the zoo in 2009 from Birmingham Zoo in Alabama, according to the statement.
“We invite you to share fond memories of Ricko. Our condolences to the animal care and veterinary staff who cared for Ricko, and to everyone he was special to,” the statement read.