Please read Crows 1/2/3/4
Having always known, as far back as I can remember as a tiny child, it is my belief, which I have always passed on to others of spiritually inquiring minds, that birds are messengers and like all non humans beings, they are aware of energies unseen by the human eye.
Think of your own domestic pet and observe what they see, out of your own vision but clear to them. Horses and dogs especially are aware of your moods, their love is unconditional. Undomesticated beings are at one with nature and all surrounding them, they know where to find food, water and shelter, flee when danger is near, sensing what is coming and alerting their own kin. Survival is priority but they are non destructive, this is a human activity.