Ostrich.
'Ostriches are known to bury their heads deep into the sand, searching for facts, before making judgements. This it at odds with the common old man, who prefer to jump to the most negative conclusion, almost immediately. As a result, the ostrich looks a lot less silly than the old man.'
- Science
Contrary to popular belief, ostriches do not bury their heads in the sand. The old saw probably originates with one of the bird's defensive behaviors. At the approach of trouble, ostriches will lie low and press their long necks to the ground in an attempt to become less visible. Their plumage blends well with sandy soil and, from a distance, gives the appearance that they have buried their heads in the sand.
- National Geographic