Saraveca language

Saraveca
Native to	Bolivia
Region	Eastern jungle
Extinct	(date missing)
Language family	Arawakan Southern ? Paresí–Xingu Paresí Saraveca
Language codes
ISO 639-3	sar
Glottolog	sara1331[1]

Saraveca is an extinct Arawakan language once spoken in Bolivia by the Sarave. It is said^[2][3] to be the only language with a numeral system based exclusively on five, although quinary systems exist. To some extent this is also an areal feature of other South American languages; many form their numbers 6–9 as "five + one", "five + two" and so on.

References

1. Nordhoff, Sebastian; Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2013). "Saraveca". Glottolog. Leipzig: Max Planck Institute for Evolutionary Anthropology.
2. Wells, David (1997). The Penguin Dictionary of Curious and Interesting Numbers. Penguin UK. ISBN 978-0-14-026149-3.
3. Encyclopædia Britannica, "Numerals and numeral systems".