A little known extinction...

Too often we think that the only reason tied to the man which leads a wild species to the extinction is the indiscriminate hunting and the destruction of the habitat. 
Unfortunately, a much more sneaky and hard to notice threat is represented by a wide range of animals (more or less domestic) which always accompany the men when they arrive in a new place. 

It is enormous the number of mammals, reptiles and birds that became extinct because of the arrival in their nesting places of dogs, cats and especially mice. 
Sadly, history teaches that man, even indirectly, has never been able to protect a wild place after having discovered it. 

By way of example, you may remember what happened to the Dieffenbach rail, discovered in 1843 in Chatham Island, which became extinct in less than 10 years because of the massacre of chicks by mice that had arrived with the European ships. 
The Tahiti rail, besides having been boarded on ships as "fresh food storage", became extinct mainly because of predation by cats in 1844. 
The Southern merlin became extinct in less than 60 years because of predator mammals which arrived in its habitat with the Europeans. 

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