Oates (1975:317, 388) describes Biringal N105 and Heath Biḍiḍal (N116.B) (1980:2) as an alternative name of Ritharrngu N104.
Heath describes Biḍiḍal and Ritharrngu as (clan) names used as a language name.
Schebeck (2001:54) lists Bidingal as a sub-group of Ritharrngu N104.
Bidingal is also a surname affiliated with Ritharrngu N104. In this database Birdingal is restricted to a people name. For Yolngu languages see Yolngu Matha N230.
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Speaker numbers were measured differently across the censuses and various other sources listed in AUSTLANG. You are encouraged to refer to the sources.
Speaker numbers for ‘NILS 2004’ and ‘2005 estimate’ come from 'Table F.3: Numbers of speakers of Australian Indigenous languages (various surveys)' in 'Appendix F NILS endangerment and absolute number results' in McConvell, Marmion and McNicol 2005, pages 198-230 (PDF, 2.5MB).