The "Yigüirro" (Turdus grayi), also known as the clay colored robin or gray thrush, was designated National Bird on November, 1976. The "Yigüirro," found throughout Costa Rica , represents the fertility of the earth, the symbol of the rain fertilizing the earth, the richness of Costa Rican soil. The "Yigüirro" sings to claim rain since it generally sings at the beginning of the rainy season and mate during that season.

The nesting season takes place between April and May. During this time, the "Yigüirro" does not sing and lays from two to three eggs.