hawk owl

from The Century Dictionary.

• noun The day-owl, Surnia ulula or Ulula funerea: so called from its diurnal habits and notable rapacity.
• noun The short-eared owl. Strix brachyotus or Asio accipitrinus.
• noun The harfang or great snowy owl, Nyctea nivea.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun grey-and-white diurnal hawk-like owl of northern parts of the northern hemisphere