Abstract
I recorded songs of Dusky Warbler Phylloscopus fuscatus at the Sarobetsu Marsh in Hokkaido on June 12, 2008. Dusky Warblers have been known as migrants or winter residents in Japan, and this is the first record of their songs in the breeding season. Dusky Warblers are difficult to find and identify since they live in bushes. Knowing their songs will make it easier to identify them during the breeding season. I hope this report helps us to confirm their breeding in Japan.
