The First Authentic Breeding Record of the Von Schrenck's Bittern in Hokkaido

Abstract

During bird observation in July and August, 2014, and from June to August, 2015, in coastal grassland in Zenibako (43°09´N, 141°13´E), central Hokkaido, the breeding record of Von Schrenck's Bittern Ixobrychus eurhythmus was confirmed by observation of juveniles. One juvenile was captured by hand and banded with Kankyosho ring 8A-29943 on August 10, 2015. Measurements of the juveniles are as follows: natural wing length: 109.2, Maximum wing: 120.0, exposed culmen: 36.5, Tarsus: 41.5, Total length: 290, Wing span: 480 in mm. Body weight: 110 g.