Things we lost... Falkland Islands wolf.

The Antarctic wolf (Dusicyon Australis) was a native of the Falkland Islands. 
Because of its small size, it was perfect for life on those islands, rich of low and dense forests. 
It hunted birds and small mammals, both in the green spots and in the moors, swept by the cold southern winds. 
Darwin described it, in 1833, as common and meek. Unfortunately, these features couldn't save it from the inhabitans of the islands, who came from England and massacred it, up to the last specimen with the excuse that they had to protect the flocks of sheep. 
It became extinct just twenty years after the arrival of the Europeans in the Falkland Islands. 

(Thanks to Lorenzo S. for helping me writing this post)