Senior zebra at Calgary Zoo euthanized due to failing health

Chela, a 22-year-old female Hartmann's mountain zebra at the Calgary Zoo, was euthanized after living long past her life expectancy. (Calgary Zoo) Chela, a 22-year-old female Hartmann's mountain zebra at the Calgary Zoo, was euthanized after living long past her life expectancy. (Calgary Zoo)