common murre; common guillemot
A seabird species (Uria aalge). In Japanese, the name is almost always written in katakana as ウミガラス.
ウミガラスは北太平洋や北大西洋の沿岸で繁殖する。
Common murres breed on the coasts of the North Pacific and North Atlantic.
thick-billed murre; Brünnich's guillemot
razorbill
Katakana spelling is standard for this bird name; usually written in kana.
Kanji form using 烏 (crow/raven); rarely used in modern Japanese.
Alternate kanji form using 鴉 (crow/raven); even less common than 海烏.
Compound of 海 (umi, 'sea') and 烏 (karasu, 'crow'), literally 'sea crow', likely from the bird's dark plumage and seabird habits.