The birds are designed to emphasize the corners of the capital rather than the sides. The impost, with the birds laced around each other's neck, then become the focus of the each face, rather than the main composition. The decorated surface is an essential component of the Romanesque style.

East-south View.

West View.

Related capitals:

Foliage capitals: 7, 21, 23, 26, 31, 33, 34, 36, 41, 45, 50, 55, 59, 65, 68, 70, 74

Bird Capitals: 2, 4, 29, 40, 43, 60, 69

Dragons and Beasts: 28, 29, 66, 69, 72

Angels: 46, 58

Non-Narrative Capitals:
Capital 3: Babylonia Magna
Capital 9: Jerusalem Sancta
Capital 11: Symbols of the Evangelists
Capital 51: The 4 Evangelists with Beast Heads
Capital 71: Personifications of the Beatitudes

The New Oxford Annotated Bible with the Apocrypha, Revised Standard Version.
Inscriptions based on Robert Favereau, Jean Michaud, and Bernadette Leplant, Corpus des Inscriptions de la France Medievale. Vol. 8, Ariege, Haute-Garonne, Hautes-Pyrenees, Tarn-et-Garonne. Paris: Centre National de la Recherche Scientifique, 1982.
In this case, Favereau, Michaud, and Leplant mistakenly identifies turns the descriptions and inscriptions, so they do not match the actual capital. These mistakes are corrected here.