Tasmanian tiger

The  — also known as the Thylacine or, formally, Thylacinus cynocephalus — was a small, doglike marsupial mammal. According to The I-Supder Book of Earth Creatures, it had "a smooth brown coat with black or darker brown stripes on its rear." A third of its 160cm length was given over to its tail alone. As in many mammals, males were generally larger than females.

It was made extinct due to targeted killing by humans in the 19th and 20th centuries. Natural disease was also a contributing factor to their extinction, which finally occured in 1936.

It had an I-Spyder points value of either 250 or 300 points. (NSA: The Last Dodo)

Behind the scenes
The Last Dodo is not consistent in its point value for the, giving it a value of 300 points on its individual entry page, but then a value of only 250 when included in a chart of other animals.