Two Costa Rican Stone Mace heads, Late Preriod IV, ca. A.D. 1-500

comprising a white stone stylized head of an owl with pointed beak and short tufts above, and a human head with small puckered mouth and slender nose, the ears out to the side and with large sunken eyes; in speckled stone, each pierced through the center. 

Parke-Bernet Galleries, New York, January 28, 1966, lot 41

New York, PreColumbian Art in New York, Selections from Private Collections, The Museum of Primitive Art, September 12-November 9, 1969 , no. 201, for the human head.

Fine, both intact. The white owl could be cleaned to show whiteness.
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Owl effigy mace heads are usually from the Atlantic Watershed region, and the styles conform to three types of indigenous species, the Great Horned Owl (Bubo virginianus), the short eared owl ( Asi flammeus)  and the barred or barn owl ( Strix varia, and Tyto alba) (De La Cruz in Lange, 1988, pg. 122).

See Lange, ed. (1988: fig. 6.2), for similar examples of the owl and human head types.