Dozens of koalas have been killed or injured and left for dead during logging of blue gum plantations in South Australia, according to former employees of the harvesting company and a conservation organisation that tried to save the marsupials. Ex-employees of the company managing the plantation estate Australian Agribusiness Group said they tried to save at least 40 injured koalas and saw about 20 that had been killed as plantations on Kangaroo Island were cleared for agricultural use. They described injuries including broken skulls, jaws, arms and hips. Guardian Australia has seen photos of seriously injured and dead koalas taken at the site. Australian Agribusiness Group said it adhered to environmental land management practices, had welfare practices in place and any concerns would be investigated.