Taiwan Bamboo Partridge in Yangmingshan

A Taiwan Bamboo Partridge (Bambusicola sonorivox) calling along the trail at Xiaoyoukeng.

Toward the end, its calls get spaced out more and more. It sounded like it was growing tired, or giving up.

(I went back and measured it afterward. Over these twenty seconds the gap between calls goes from about a third of a second to half a second, and then it just stops.)