From the Nature Index Paid Content. Accipitridae Accipitridae is a family of birds of prey, which includes hawkseagleskitesharriers and Old World vultures. I heard a loud repetitive call believing it to be coming from a nest but when I looked there was a dark brown bird, a little bigger than a blackbird, in the pine tree. When it flue away it had quite a large wing span. I would really appreciate any help.