Alex Mustard / Shoal of three Bigfin reef squid (Sepioteuthis lessoniana) in open water at night. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Bigfin squid (Sepioteuthis lessoniana) hovering in mid water at night. Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean.

Alex Mustard / Portrait of Bigfin squid (Sepioteuthis lessoniana) hovering in open water above a coral reef at night. Dampier Strait, Raja Ampat, West Papua, Indonesia. Tropical West Pacific Ocean

Juergen Freund / Bigfin reef squid (Sepioteuthis lessoniana) blurred motion photograph, Kimbe Bay, West New Britain, Papua New Guinea.

Constantinos Petrinos / Bigfin reef squid (Sepioteuthis lessoniana) schooling parallel to one another. Lembeh Strait, North Sulawesi, Indonesia.

Alex Mustard / Big fin reef squid (Sepioteuthis lessoniana) descends from open water to the reef at night. Arafur Sea, Triton Bay, West Papua, Indonesia.

Juergen Freund / Mating pair of Big fin reef squids {Sepioteuthis lessoniana} Indo Pacific

Juergen Freund / Big fin reef squid {Sepioteuthis lessonians} Indo Pacific

Constantinos Petrinos / Big fin reef squid in deep water {Sepioteuthis lessonians} Sulawesi, Indonesia Indo-Pacific

Alex Mustard / Long exposure of a bigfin reef squid (Sepioteuthis lessoniana) in open water at night. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea..

Alex Mustard / Bigfin reef squid (Sepioteuthis lessoniana) at night. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Bigfin reef squid (Sepioteuthis lessoniana) with a captured rabbitfish (Siganus sp.) in its arms, at night. ;Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.