Can someone please explain the crow?

I saw the crow a couple times over the last couple episodes over the course of season 2 but never understood it. I always just thought it was some sort of motif for jinx because I remember her shooting one (which was a little depressing at the time) but I never truly understood it. Could someone please explain its meaning and why jinx shot it? Vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv