Some college football jobs are safe. For instance, the only thing Texas A&M QB Johnny Manziel and Oregon QB Marcus Mariota need to fear is injury.
Other schools have no safe positions. Take Ole Miss. After a top-10 recruiting class, the Rebels are still willing to put anyone anywhere as long as it's an improvement.
College football is one of the most fluid sports in the country, and anyone can go anywhere at a moment's notice. Performances are evaluated weekly, and there are only so many positions to fill.
The following players are in the most danger of losing their jobs this spring. Some will be pressured by 2013's early arrivals. Others will be targeted by returning teammates.
Here are the 25 most precariously perched players in college football this spring.