Sei whale (Balaenoptera borealis) is a baleen whale, the third-largest rorqual after the blue whale and the fin whale. Azores, Portugal, Atlantic Ocean.

balaenoptera borealis spring sunbeam adult alone swim profile shot overview underwater shot blue temperate sea balaenoptera endangered (iucn) en azores archipelago sei whale (balaenoptera borealis) cites appendix 1 april macaronesia nobody springtime sunbeams ray of sunlight adults single lonely only solo one lone swimming (action) swimming profile sights profile sight profile shots profile view profile views side view overviews global sight global sights full length subaquatic photos subaquatic sights seen under the water photos under the water underwater shots subaquatic image underwater view submarine images submarine sights submarine sight submarine photos submarine photo underwater views submarine photographies submarine photography underwater underwaterphoto underwaterpicture underwaterphotography underwaterphotographies underwaterphotos underwaterpictures temperate seas temperate ocean temperate oceans endangered species azores azores (region) rudolphi's rorqual sei whales (balaenoptera borealis) with nobody temperate season seasons ambiance sun space stage of development individual enumeration locomotion motion shot colour sea marine area area balaenopteridae cetacea mammalia cynodontia therapsida eupelycosauria synapsida tetrapoda tetrapodomorpha rhipidistia sarcopterygii euteleostomi gnathostomata vertebrata chordata deuterostomia coelomata bilateria metazoa opisthokonta eukaryota threatened endangered species iucn red list of threatened species species portugal european union europe rorqual whale cetacean marine mammal mammal therapsid synapsid vertebrate chordate wild animal animal convention on international trade in endangered species of wild north atlantic ocean atlantic ocean world sea and ocean