Fig. 1

Cross-sections through the Computed Tomography dataset of the iodine stained head of Columba livia. a,b, dataset 2, c,d, dataset 3. a 499 of 879 (parasagittal plane, yz). b 1065 of 1678 (coronal plane, xz). c 387 of 667 (parasagital plane, yz). d 1026 of 1515 (coronal plane, xz)