Hooded Parrots Psephotus dissimilis occur in central northern Australi
a. They excavate nests in termitaria: mean nest densities ranged from
0.45 to 0.70 per km(2). Clutches were initiated from late January to m
id-April. Cavity temperatures varied less with respect to external tem
peratures in large termitaria than small. Sites differed in volumes of
termitaria, and in the direction and height of cavity entrances. Aver
age clutch size was 4.3 and egg dimensions (20.8 x 18.3 mm) did not va
ry across sites. There was no difference in nesting success between si
tes; of the eggs laid, about 50% produced fledglings.