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Who will be the Ravens' new backup QB in 2015?

The Baltimore Ravens will have a different backup quarterback for the first time since 2010.

Tyrod Taylor, who was the team's No. 2 quarterback behind Joe Flacco for the past four seasons, signed with the Buffalo Bills, according to ESPN Bills reporter Mike Rodak. Taylor will compete against Matt Cassel and EJ Manuel for a spot on the Bills' roster.

A sixth-round pick in 2011, Taylor was rarely used and was considered a below-average backup because of his inconsistency throwing the ball and his decision-making. He threw seven touchdowns and eight interceptions in four years of work in the preseason.

The Ravens will likely bring in a veteran quarterback to compete with Keith Wenning, a sixth-round pick from a year ago who spent his rookie season on the practice squad. It would be difficult for the Ravens to give the job to Wenning based on his inexperience.

The free-agent market for quarterbacks is a ragged one:

Christian Ponder: Even though he struggled with the Vikings, Ponder was rated high on the Ravens' draft board in 2011, when Minnesota selected him 12th overall. He went 14-21-1 as a starter, throwing 38 touchdowns and 36 interceptions. Ponder is intriguing because he's smart, mobile and has sufficient arm strength. He spent last season as Teddy Bridgewater's backup.

Michael Vick: The Ravens might be Vick's best bet to stay in the NFL. Ravens quarterbacks coach Marty Mornhinweg coached Vick as the Jets' offensive coordinator last season and spent four years with Vick in Philadelphia. Vick turns 35 in June and may have one more year left in him. Still a gifted athlete, he started three games for the Jets last season, going 1-2.

Jordan Palmer: He spent most of last year's training camp with the Chicago Bears before losing the backup job to Jimmy Clausen. Still, Palmer has ties with new offensive coordinator Marc Trestman, who saw similarities between Palmer and Josh McCown. Palmer, 30, who entered the league in 2007, has attempted just 18 regular-season passes over five appearances.

Matt Moore: He's considered one of the top backups in the league, even though he hasn't played much the past three seasons. Moore can get the ball downfield and is capable of winning games in a pinch. He's 11-12 as a starter but has only thrown 10 passes the past two seasons as Ryan Tannehill's backup in Miami. The question is whether he would want to play behind another durable quarterback like Flacco.

Tarvaris Jackson: He's expected to re-sign with Seattle, according to ESPN Seahawks reporter Terry Blount.

Matt Flynn: The problem with Flynn is he's done well in Green Bay and couldn't stick anywhere else (Seattle, Oakland and Buffalo). Flynn went 2-2 for the Packers in 2013 when Aaron Rodgers was hurt, but he only played in mop-up duty last season. He's thrown 17 touchdowns and 11 interceptions in his seven-year NFL career.

Colt McCoy: He put together a surprisingly good stretch in Washington last season, when he led the Redskins to an upset of the Cowboys on Monday Night Football. McCoy then returned to backing up Robert Griffin III and struggled in two late-season starts. He lacks the arm strength to consistently succeed at this level. McCoy will likely be on his fourth team in four years.

The void at backup quarterback isn't really a major concern for the Ravens. The team's backup quarterbacks since 2008 -- from Todd Bouman to Troy Smith to Marc Bulger to Taylor -- have rarely gotten on the field because of Flacco's durability.

Flacco has never missed a game in his seven-year NFL career, starting 127 straight games (including playoffs). That's the sixth-longest streak in NFL history.