Warao is spoken principally along the Venezuelan
coast from the Orinoco delta to the Guyana border. Osborn
(1966) lists /p/ rather /b/ as the bilabial stop phoneme,
but reports that "the voiced allopyhone [b] is heard more
frequently than the voiceless [p]". /t/ "has the allophone
[t] in all positions". The alveolar lateral flap occurs as
[d] word-initially and as a nonlateral flap before /a/
when preceded by /i,a/. Nasalized vowels occur mostly .
Nasality spreads from a nasal consonant to all following
vowels and glides between the nasal and a following
obstruent or word-boundary but a number of words also have
unconditioned nasalized vowels.

Osborn, H.A. 1966. Warao I: phonology and morphophonemics.
International Journal of American Linguistics 32/2:
108-123.