During the day it resorts to the hollow branches or spouts as they are called, and the holes of the gum-trees, sallying forth as night approaches in quest of insects, particularly the smaller _Coleoptera_, upon which it chiefly subsists. Its flight is straight, and not characterized by the sudden turns and descents of _Caprimulgus_. On driving it from its haunts I have sometimes observed it to fly direct to a similar hole in another tree, but more frequently to alight on a neighbouring branch, perching across and never parallel to it. When assailed in its retreat it emits a loud hissing noise, and has the same stooping motion of the head observable in the Owls; it also resembles that tribe of birds in its erect carriage, the manner in which it sets out the feathers round the ears and neck, and in the power it possesses of turning the head in every direction, even over the back, a habit it is constantly practising. A pair I had for some time in captivity were frequently leaping to the top of the cage, and had a singular mode of running or shuffling backwards to one corner of it. While traversing the woods, the usual mode of ascertaining its presence is by tapping with a stone or a tomahawk at the base of the hollow trees, when the little inmate, as represented in the upper figure of our Plate, will almost invariably ascend to the outlet and peep over to ascertain the cause of disturbance. If the tree be lofty or its hole inaccessible, it will frequently retire again to its hiding-place, and there remain until the annoyance be repeated, when it flies off to a place of greater security. In these holes, without forming any nest, it deposits its eggs, which are four or five in number, perfectly white, nearly round, and about one inch and a line in length and eleven lines in breadth. At least two broods are reared by each pair of birds during the year. I have known the young to be taken in Van Diemen’s Land in October, and in New South Wales I have procured eggs in January. Specimens from Van Diemen’s Land, Swan River, South Australia, and New South Wales, all present considerable difference in the colour and markings of the plumage, but none of sufficient importance to justify their separation into distinct species: in some the nuchal band and the circular mark on the head are very conspicuous, while in others scarcely a trace of these markings is observable; these variations do not depend upon habitat, but are constantly found in specimens from the same localities. Little or no difference is apparent in the size or plumage of the sexes.