This collaboration provides a first look at how avian visual acuity and sensitivity have evolved in concert with nest architecture strategies. Using existing databases on eye size, nest construction behavior, and traits related to the color of eggs and nestling gapes for over 1600 species of Passerine birds, our results point toward the evolution of a pervasive set of interactions between the visual system and avian reproductive dynamics as mediated by nest architecture. The paper is now in Evolution.