What the heck is a Thylacine?

In the US National Zoo 1906 www.wikipedia.org - click to enlarge

On September 7, 1936 the last Thylacine, Benjamin, died in zoo in Hobart, Tasmania, Australia.  The curious critter was the last known carnivorous marsupial.  They lived in Australia and New Zealand.
  Competent hunters they roamed the sparsely populated back country, their common names were Tasmanian Wolf, or Tasmanian Tiger.
  It was odd, even for a marsupial, in that both sexes had pouches, the male pouches acted as a cover for the reproductive organs while running through the brush, the female pouch was used like a kangaroo does.
  You never know what's out there.

A Thylacine family, Baumanns Zoo, Hobart, Australia 1910 www.wikipedia.org