Grasses are great for feed, but for cover choose some local native shrubs which are not too tall.
The natives are generally more tolerant of poor sandy soils than the introduced species.
Lots of them have good dense cover and the flowers and fruit attract insects for the birds.
There are many Correa, Callistemon, Dryandra and Grevillea species that do well in our cold climate; get down to Pialligo one day and cruise the nurseries.
I like the flowering groundcovers too, as something low to attract insects and provide a break in the grass and some interest for the birds.
In this category, Myoporum spp. and some prostrate Grevilleas do well around here.
Avid amateur aviculturalist; I keep mostly australian and foreign finches.
The art is long, the life so short; the critical moment is fleeting and experience can be misleading, crisis is difficult....... (Hippocrates)