diving petrel; common diving petrel
Refers to the common diving petrel (Pelecanoides urinatrix) or diving petrels in general. A technical bird name; in everyday contexts, the katakana form is standard.
The diving petrel is a small seabird that inhabits the oceans of the Southern Hemisphere.
I looked up the ecology of the diving petrel in a field guide.
Kanji form is rare and may not be widely recognized; lists it but the word is usually written in kana.
Compound of 潜り (moguri, 'diving') + 海燕 (umitsubame, 'petrel'). The exact derivation is uncertain, but the name describes the bird's diving behavior.