English: A Overlap of MRI pigeon brain within the CT head data and the pigeon’s brain position. As transparent structures, the eye and the embedding skull are visible. Please note the large eye and the enlarged cerebrum. B Sagittal depiction of the visual pathways in the pigeon brain. Birds have two main visual pathways known as the tectofugal and thalamofugal systems that correspond to the mammalian extrageniculocortical and geniculocortical pathways, respectively. C Sagittal view of the pigeon forebrain with a highly schematized depiction of the avian sensory cortex. D The connectome of the pigeon cerebrum in sagittal view. Nodes are color-coded according to module membership.