noun
Japanese marsh warbler
A bird species (Megalurus pryeri) native to Japan; the name is a specific ornithological term.
オオセッカは湿地に生息する鳥です。
The Japanese marsh warbler is a bird that inhabits wetlands.
The name likely derives from 大 (おお, 'large') and 雪加 (せっか, 'zitting cisticola'), a related bird, but the exact origin is uncertain.