傷病鳥は負傷原因だけでなくその個体の由来に関する情報を提供してくれる．2020年4月に滋賀県草津市で衰弱して救護された1個体フクロウStrix uralensis (Strigidae)を詳しく調べた．外貌の嘴と爪の状態から，飼育歴があると判定した．エゾフクロウS. u. japonica 3個体と本州の亜種フクロウ8個体，そしてキュウシュウフクロウS. u. fuscescens 2個体のサンプルとのミトコンドリアDNAを使った系統解析の結果，本個体は本州亜種あるいは九州亜種である可能性が考えられた．
A female with four juveniles and seven female-type birds of unknown age of the Harlequin Duck Histrionicus histrionicus were observed during the breeding seasons of 2015 and 2016, respectively, in the Zakko River, northeastern Nagano Prefecture. During the breeding season from 2017 to 2020, the present and breeding status of the Harlequin Duck population was investigated. In all the years surveyed, several Harlequin Ducks were observed, and flightless chicks with natal down were found in 2019 and 2020. Therefore, the study area is the southernmost breeding site of the Harlequin Duck in Japan.
In Hokkido, the Kamchatka Leaf Warbler Phylloscopus examinandus occurred mainly from late May to mid-June at low altitudes, and from late June to late July at altitudes over 1,000 m above sea level. They were recorded in Pinus pumila forests, mixed forests of evergreen and deciduous broad-leaved trees, deciduous broad-leaved forests and wooded areas in agricultural land and residential areas, but were not observed in evergreen forests and Larix plantations.