Jiri Lochman / Thylacine (Thylacinus cynocephalus) taxidermy model, Tasmanian Wilderness UNESCO Natural World Heritage Site, Tasmania, Australia. Extinct

Dave Watts / Painting of a Thylacine (Thylacinus cynocephalus) by David Hopkins. Extinct species. Editorial use only.

Dave Watts / Thylacine (Thylacinus cynocephalus) specimen in Launceston Museum, Tasmania, Australia.

Dave Watts / Historical photograph of the last Thylacine (Thylacinus cynocephalus) in Hobart Zoo which died in 1936, Tasmania, Australia. Extinct species.

Dave Watts / Historical photograph of the last Thylacine (Thylacinus cynocephalus) in Hobart Zoo, Tasmania, Australia. Extinct species.

Dave Watts / Painting of a Thylacine (Thylacinus cynocephalus) by Diane Green. Extinct species. Editorial Use Only.

Dave Watts / Historical photograph of Thylacine (Thylacinus cynocephalus) with mouth open. Extinct species.

Juergen Freund / Aboriginal rock art of extinct Thylacine (Thylacinus cynocephalus) Kakadu National Park, Northern Territory, Australia. December 2012.

Enrique Lopez-Tapia / Spotted hyaena (Crocuta crocuta) at night, Etosha National Park, Namibia.

Lou Coetzer / Spotted hyena (Crocuta crocuta) stalking Greater kudu (Tragelaphus strepsiceros) Etosha National Park, Namibia, July.

Lou Coetzer / Greater kudu (Tragelaphus strepsiceros) striking out hind legs at pursuing Spotted hyena (Crocuta crocuta) Etosha National Park, Namibia, July.

Lou Coetzer / Spotted hyena (Crocuta crocuta) growling, Chudop Waterhole, Etosha National Park, Namibia, July.

Dave Watts / Thylacine (Thylacinus cynocephalus) historical photo of skin drying on a gum tree, Tasmania, Australia.

Dave Watts / Thylacine (Thylacinus cynocephalus) skull, showing distinct supra orbital ridge, Tasmania, Australia.

Dave Watts / Thylacine / Tasmanian tiger / Tasmanian wolf skull {Thylacinus cynocephalus} Tasmania, Australia

Pete Oxford / Tiger (Panthera tigris) and Wolf (Canis lupus) performing animals in permanent home, Primitive Forest Tourist Park, Xishuangbanna, Yunnan Province, China

Dave Watts / Thylacine / Tasmanian tiger / Tasmanian wolf {Thylacinus cynocephalus} last known individual. Tasmania

Bristol City Museum / Thylacine / Tasmanian tiger / Tasmanian wolf skeleton. Native to Australia extinct 1936 {Thylacinus cynocephalus}

Bristol City Museum / Thylacine / Tasmanian tiger / Tasmanian wolf - native to Australia extinct 1936 {Thylacinus cynocephalus}. Museum specimen

Paul D Stewart / Illustration of extinct Thylacine / Tasmanian Tiger (Thylacinus cyanocephalus) engraved by W. Lizars. From Jardine's series 'The Naturalist's Library; Mammalia' 1841 ('The Natural History of Marsupial...

Martin Camm / Carwardine / Illustration of Tasmanian Tiger (Thylacinus cynocephalus), Thylacinidae; extinct in 20th century (Wildlife Art Company).

Dave Watts / Thylacine / Tasmanian tiger (Thylacinus cynocephalus) plaster cast of hind foot of large adult, central highlands, North Tasmania, Australia. 2005.