Internal anatomy of a bird diagram! This learning resource contains a diagram for the internal anatomy of a bird. Answer key and lined student sheet included! Internal organs included in this booklet: bird, brain, spinal cord, heart, respiratory system, trachea, lungs, digestive system, esophagus, crop, gizzard, liver, bile duct, pancreas, intestines, cloaca, kidney, and ureter. If you would like to expand on this topic, check out my internal parts of a bird work booklet, info book, and 3 part