Officials of Chicago's Lincoln Park Zoo say a female klipspringer calf named Asha unexpectedly died this week.
The zoo was chosen to breed klipspringers -- which are dwarf antelope found in central and eastern Africa -- as part of a species survival program. The calf was born in March and her mother was unable to provide adequate care. Zookeepers stepped in to provide around-the-clock care following her birth.
Officials say Asha had been thriving under the zoo's program. But a zookeeper on Wednesday found the calf unresponsive and rushed her to a veterinary hospital where she was confirmed dead. The cause of death is unknown.
A necropsy will be performed to determine the cause of death. Zoo officials say the results will likely take a couple of weeks.