Green’s Dictionary of Slang

(Aus.) a prostitute; thus charity crow, a prostitute who does not charge, esp. to impecunious soldiers during WWII; society crow, an upmarket prostitute, a courtesan.

1944		T. Hartley glossary in Simes DAUS (1993) 59: A society crow is a prostitute who moves in high society. A charity crow is a girl who does not charge for her services, a type produced during the war. Similar terms are a residential crow, a bed and breakfast crow.
1965		E. Lambert Long White Night 80: ‘Where do yer think? Get a bit of twot.’ ‘That big cafe down on the waterfront. The Universal. The crows hang round there in droves.’.
1980		B. Herbert No Names 77: What are you, anyway? A Kings Cross crow. Every Yank in town’s been rootin’ you [AND].