The Nez Perce pack of Yellowstone started with 6 wolves captured and relocated to Wyoming from Canada in 1996. The pack initially had trouble adjusting to the move with several escapes from the acclimation pens and multiple livestock depredations (cause for the offending wolf to be shot). Eventually the pack began to thrive, reaching its peak in 2002 with a total of 20 wolves. The Nez Perce wolves were led for seven years by two brothers (70M and 72M) and a female (48F) until all three of them passed in 2005 and the pack subsequently dissolved.