Buffalo Bills training camp live updates, 7/31

It's here, friends: the 2015 Buffalo Bills season officially began this morning with the first training camp practice of the year from St. John Fisher College. These were the biggest news items as reported live from the field; we'll circle back around a bit later on as beat reporters begin fleshing out their thoughts from what they observed at Growney Stadium.

Mario activated

Mario Williams has officially been added back to the active roster.

— Sal Capaccio (@SalSports) July 31, 2015

#Bills HC Rex Ryan: Mario had a minor back thing, but he's fine. He's ready to roll.

— Joe Buscaglia (@JoeBuscaglia) July 31, 2015

Cassel, Taylor split QB1 reps

Matt Cassel and Tyrod Taylor taking 1st team reps today in 11-11s. Taylor just scrambled and threw TD to Goodwin.

— Mike Rodak (@mikerodak) July 31, 2015

Kouandjio starts at RT

Matt Cassel takes the first QB rep of warm up drills. Kouandjio still at RT.

— Mike Rodak (@mikerodak) July 31, 2015

Darby starts for Leo

Ronald Darby running w/1st team at McKelvin's LCB spot in walk thru team. #Bills

— Chris Brown (@ChrisBrownBills) July 31, 2015

Graham > Duke

Duke Williams looks like he's working with the second team defense. Corey Graham and Aaron Williams running with the starters.

— Matthew Fairburn (@MatthewFairburn) July 31, 2015

Harvin at CB?

Harvin just played corner back for 2 snaps. They didn't throw it his way

— Howard WGR (@hsimon62) July 31, 2015

#Bills HC Rex Ryan: Percy Harvin came to us about practicing at corner to help out. We're going to see what he can do, not over coach him

— Joe Buscaglia (@JoeBuscaglia) July 31, 2015

Sammy looks healthy

The good news from Bills camp: Sammy Watkins looks p healthy from my vantage point. Explosive as ever off the line.

— Matthew Fairburn (@MatthewFairburn) July 31, 2015

Anderson coaches OL

As expected #Bills Asst. OLine coach Kurt Anderson leading things in Kromer's absence @wgrz pic.twitter.com/dm6K2Fwy7K

— Adam Benigni (@AdamBenigni) July 31, 2015

Here's some good OL-work video for you. Kurt Anderson coaching the unit. #Bills pic.twitter.com/2tXzZ3icOo

— Sal Capaccio (@SalSports) July 31, 2015

11-on-11, twice

Bills have two full 11 on 11 groups going at once. Cassel/Taylor on one half, Manuel/Simms on the other.

— Tyler Dunne (@TyDunne) July 31, 2015

Rex: We are going to two-spot drills more than I ever have before. Credits Greg Roman for bringing that. Players get more reps.

— Sal Capaccio (@SalSports) July 31, 2015

Cargo shorts FTW

#Bills owner Terry Pegula at training camp pic.twitter.com/DsmXUvobqp

— Joe Buscaglia (@JoeBuscaglia) July 31, 2015

Grid View

• Buffalo Bills fans take in the first training camp practice of 2015. (Mandatory Credit: Mark Konezny-USA TODAY Sports)
• Buffalo Bills running back LeSean McCoy catches a pass during a drill at training camp. (Mandatory Credit: Mark Konezny-USA TODAY Sports)
• Buffalo Bills running backs Karlos Williams (left), Anthony Dixon (middle), and Bryce Brown (right) wait in line during a drill at training camp. (Mandatory Credit: Mark Konezny-USA TODAY Sports)
• Buffalo Bills head coach Rex Ryan instructs linebacker Ty Powell between reps at training camp. (Mandatory Credit: Mark Konezny-USA TODAY Sports)
• Buffalo Bills secondary coach Donnie Henderson takes in a drill during the first training camp practice of the year. (Mandatory Credit: Mark Konezny-USA TODAY Sports)
• Buffalo Bills head coach Rex Ryan fields questions from reporters following his team's first camp practice of 2015. (Mandatory Credit: Mark Konezny-USA TODAY Sports)
• Buffalo Bills running back Fred Jackson speaks with reporters following the first training camp practice of 2015. (Mandatory Credit: Mark Konezny-USA TODAY Sports)
• Buffalo Bills running back LeSean McCoy fires up the crowd following his first training camp practice with the team. (Mandatory Credit: Mark Konezny-USA TODAY Sports)
• Buffalo Bills running back LeSean McCoy signs autographs for fans following his first training camp practice with the team. (Mandatory Credit: Mark Konezny-USA TODAY Sports)
• Buffalo Bills quarterback EJ Manuel signs autographs for fans following the first training camp practice of the 2015 season. (Mandatory Credit: Mark Konezny-USA TODAY Sports)
• Buffalo Bills quarterback Matt Cassel signs autographs for fans following his first training camp practice with the team. (Mandatory Credit: Mark Konezny-USA TODAY Sports)