In field studies of birds it is often necessary to age and sex individuals. Both sexes of Eastern Rosellas Platycercus eximius have similar plumage but that of adult males, particularly the red feathers of head and breast, are brighter than those of females and young birds. Another difference is the two rows of spots on […]
Results of nest site fidelity from colour-banded passerines at Moruya, New South Wales, between 1975 and 1981 are presented. Data are given for eight species and size of territory is discussed.
A brood of four nestling Marsh Harriers Circus aeruginosus hatched over approximately seven days. When the three older nestlings were banded, the fourth and youngest was one quarter of the weight of the next older nestling The youngest nestling was killed and eaten by its siblings during a period of food shortage. One female and […]
Recapture rates of birds netted at Brown River, Papua New Guinea, are analysed. Newly-banded birds have a much lower recapture rate than birds banded one year or more. Recapture rate of newly-banded birds is lowest in those with high breeding success and large clutches (mostly hole-nesters)and highest in those with low breeding success and small […]