I see people repeatedly confuse crows with ravens. Which is admittedly fairly easy to do. This is somewhat helpful. I would also look online or with local park rangers to see if one or the other are actually found in your area if you’re still not sure from looking at one. The difference in size alone can be a good indicator. I know many want to collect bits they may have left behind for workings. Or see their appearance as significant. So do your research first!