de Kloet, RS; de Kloet SR (2005). "The evolution on the spindlin gene in birds: Sequence Assessment of an intron on the spindlin W and Z gene reveals 4 big divisions of the Psittaciformes". 23. Parrots shift all over, https://brendayrue768558.ourcodeblog.com/30635940/the-best-side-of-cockatoos-parrots-for-sale