Free: Contests & Raffles.
Don't promote illegal activities on the site, I know it sounds trivial, but we have rules to follow.
It would be illegal.https://apps.leg.wa.gov/wac/default.aspx?cite=220-400-040(1) Except as authorized by permit of the director or as otherwise provided by this section, it is unlawful to possess wildlife found dead.
What if you possess wildlife found "barely alive" at the time of finding? I'm not familiar with a law on that one! But seriously you should take that house cat and put it in a box and maybe inform the owners it was hit by a car. Don't do anything illegal.