In most cases the weights are those of captive birds. There can be extreme variation in individuals, the weight being influenced by diet, housing, sex, sub-species and age. Where more than 10 or so birds were weighed, the highest and lowest weights were not taken into account if these differed markedly from the norm. Chick weights, with 5 or 6 exceptions, were of chicks hatched in the author's care.
Measurements are from beak to tip of tail.
There can be considerable variations in individuals of the same species, especially in those with a wide geographical range.