What specific threat signal is associated with a lowered tail in the White Bald-Headed Uakari?

Answer

A tense situation

For the White Bald-Headed Uakari, tail-wagging often communicates well-being, while a lowered tail signals a tense situation.

What specific threat signal is associated with a lowered tail in the White Bald-Headed Uakari?
behavioranimalPrimate