de Kloet, RS; de Kloet SR (2005). "The evolution on the spindlin gene in birds: Sequence Examination of the intron on the spindlin W and Z gene reveals 4 key divisions on the Psittaciformes". Kea parrots are Amongst the most smart forms of parrots globally and belong to The brand new Zealand parrot superfamily. German naturalist Alexander von Hum