Some observations on the breeding, age structure, dispersion and habitat of populations of Macropus robustus and Macropus antilopinus (Marsupialia)

Differences in breeding, population structure, dispersion and habitat are described between various species and subspecies of wallaroo (Macropus robustus robustus; M. r. cervinus; M. r. alligatoris; M. r. erubescens; Macropus antilopinus; Macropus bernardus).
Pouch young of Macropus robustus erubescens in western New South Wales were born throughout the year, while in both M. r. alligatoris and M. antilopinus then Northern Territory, most pouch young found were born during March and April.
In the populations of wallaroos in western New South Wales and the Northern Territory where there had been no systematic shooting of wallaroos for many years, 11|X% of the animals were immature. In the New England district of New South Wales where regular shooting occurs, 46|X% of the animals were immature.
The habitat of M. r. alligatoris of the Northern Territory was very similar to that of M. erubescens in inland Australia, amongst rocky hills and gullies. M. antilopinus , which is sympatric with M. r. alligatoris in the Northern Territory, also occurred in the rocky hills, but it was also found in open savannah woodland in flat and gently undulating country.
M. r. erubescens and M. r. alligatoris were almost always seen alone or in pairs, while M. antilopinus often formed larger groups.