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.
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.