"The Eastern Whipbird, Psophodes olivaceus, is found from north-eastern Queensland to Victoria. This species is an inhabitant of the brush-filled gullies and big scrub country. It is extremely shy. I have spent many a long hot afternoon in close proximity to this bird and been rewarded with but a brief glimpse at infrequent intervals. Most of the time the Whipbird is on the ground searching through the dead leaves and other debris for insects, spiders and grubs. The name is, of course, derived from its singular call, which is usually a duet. The male utters a rising, extended whistle which ends sharply and is followed immediately by the female's 'choo-choo', or sometimes 'choo-ee'. Early in the breeding season a number of pairs may indulge in concert. A loose but well-made cup-shaped nest is constructed of twigs and rootlets lined with finer materials. Two pale blue eggs are laid which have irregular markings of black and lavender-grey. The breeding season is from July to November or later. The Western Whipbird, P. nigrogularis, is found in the south-west mallee areas of Western Australia. In some publications this bird is called the Black-throated Whipbird. It was only in 1939 that this species was rediscovered; until that time ornithologists feared that the bird might have been extinct. The naturalist John Gilbert described the bird's song as harsh and grating a'nd 'quite impossible to describe . . so different from that of every other bird I ever heard or am acquainted with ...'. The Western Whipbird also has a harsh, staccato song in addition to its better known 'whipcall'. The bowl-shaped nest is constructed of bark and twigs and lined with finer material. The eggs are similar to those of the eastern species. The breeding season is from about July to November."