Sunday Night Football features a great matchup in the wild, wild west: our Arizona Cardinals are playing the Seattle Seahawks at home.

The game is ONLY on 12 News, with football coverage starting at 3 p.m.

We need you to join Team 12 in another matchup -- the great hashtag battle between Cards and Hawks fans. This will answer the question: which team has the best fans?

Here's how you help: Use #BirdGang on Twitter, Instagram and Vine. Our friends in Seattle will be using #Twelfie.

Click here to tweet your support.

We have until kickoff Sunday.

PHOTOS: Arizona Cardinals Bird Gang