(Thought I posted this request before, but can't find it.) These birds look fairly heron-like, but coloring and grouping don't seem to match. On May 6th I saw a group of 6 of them flying west over Gross Reservoir at 6:45 a.m. A neighbor said he had seen them earlier perched in the tops of several trees, looking gawky and acting raucous. We have double-crested Cormorants up here, but that's not what these are. Any clues?