Birds

The stonemason's signs > Main signs

The stork symbolizes the good that kills the evil (which is symbolized by the Serpent).
The dove symbolizes the Holy Spirit.

Churches:
Santa María de Sandoval (León), San Facundo de Sahagún, Santa María de Veruela (Zaragoza), Santa María de Moreruela (Zamora), Santa María del Azogue (Benavente, Zamora), San Miguel de la Escalada (León), Santa María de Gradefes (León).

Read more in The stonemason’s signs in the Romanesque churches in Spain.