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Chromosomal diversity in birds: (A) the most typical formulae, with 2n close to 80, such as in Vanellus chilensis (2n = 78); (B) an extreme high diploid number, such as Ramphastos tucanus (2n = 112), an atypical low diploid numbers: (C) Myiopsitta monachus (2n = 48); and an example of bird of prey (D) Spizaetus tyrannus (2n = 68). Scale bar: 5µm.
