Reminds me of a Radiolab episode[1] about a similar effort to bring back a specific species of tortoise in the Galapagos islands. The offending infringing species there where goats. What was really interesting was the method used for the eradication program.[2]

[1] http://www.radiolab.org/story/brink/ [2] https://en.wikipedia.org/wiki/Judas_goat