Related by context. Frequent words. (Click for all words.) 61 vocal folds 58 caudal 58 pharyngeal 57 vocalisations 57 membranous 57 braincase 56 zebra finch 56 ganglion 56 epididymis 56 maxillary 56 ventral 56 medulla 56 forelimb 55 pharynx 55 bird beak 55 vocalization 54 birdlike 54 morphologically 54 mandibular 54 mouthparts 54 cartilaginous 54 morphogenesis 53 oviduct 53 synovial 53 lamina 53 rufous 53 vocalizations 53 soundwaves 53 fossa 53 esophagus stomach 53 hind limb 52 bronchi 52 thorax 52 neuronal activity 52 tracheal 52 bronchioles 52 sensory organs 52 splenic 52 otolith 52 ulnar 52 humeral head 52 toadfish 52 otoliths 52 sagittal 52 ciliary 52 crocodilians 51 sexual dimorphism 51 anatomical structures 51 parathyroid glands 51 prolapsed 51 pectoral fins 51 cranial nerves 51 papillae 51 gonad 51 hyoid bone 51 humeral 51 umbilicus 51 phoneme 51 zebra finches 51 laryngeal 51 motile 51 somatosensory 51 ileum 50 sensorimotor 50 soft palate 50 cartilages 50 echolocation 50 ellipsoid 50 ganglion cells 50 vertebral column 50 ductal 50 carpal 50 inchworm 50 stereocilia 50 inguinal 50 hind limbs 50 retroperitoneal 50 vas deferens 50 radiographically 50 diaphragm 50 cerebellar 50 primary visual cortex 50 parietal lobes 50 parenchymal 49 staghorn 49 auditory cortex 49 fundus 49 vertebrate animals 49 spleen liver 49 featherless 49 entorhinal cortex 49 cambium 49 neonate 49 occipital 49 Fig. 1A 49 nasopharynx 49 teratoma 49 larynx 49 calyx 49 theropod 49 forebrain