From SentientMedia.org:
A growing body of research suggests animal personalities can impact reintroduction to the wild. When wolves were first released in remote parts of Grand County, Colorado, one year ago, researcher Marc Bekoff noticed differences in the way the individual wolves reacted. While two of the five wolves remained cautious — staying in their holding cages until coaxed out — another bolted as soon as the opportunity arose. A growing body of research says these variations in behavior can be explained by the personality of the wolves in question, but researchers and government officials don’t necessarily agree on how to take these personalities into account.