Flip Nicklin / Narwhal (Monodon monoceros) male surfacing, Canadian Northwest Territories

Flip Nicklin / Narwhal (Monodon monoceros) surfacing, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) males sparring over carcass of dead female, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros) group in ice break, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) group of males, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) males, Lancaster Sound, Baffin Island, Canada

MYN / Seth Patterson / Mexican unicorn mantis (Phyllovates chlorophaea) Sabal Palm Sanctuary, Lower Rio Grande Valley, Texas, USA, October. meetyourneighbours.net project

MYN / Seth Patterson / Mexican unicorn mantis (Phyllovates chlorophaea) Sabal Palm Sanctuary, Lower Rio Grande Valley, Texas, USA, October. meetyourneighbours.net project

Norbert Wu / Unicorn Icefish (Channichthys rhinoceratus), Antarctica

Ingo Arndt / Unicornfish (Naso vlamingii) eye, Great Barrier Reef, Australia

Flip Nicklin / Narwhal (Monodon monoceros) fluke of diving whale, Baffin Island, Northwest Territories, Canada

Flip Nicklin / Narwhal (Monodon monoceros) harvested by subsistence hunters, Baffin Island, Northwest Territories, Canada

Flip Nicklin / Narwhal (Monodon monoceros) pod in lead in pack ice, Baffin Island, Northwest Territories, Canada

Flip Nicklin / Narwhal (Monodon monoceros) meat hauled by Inuits, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros) meat and Inuit hunters, Baffin Island, Canada

Flip Nicklin / Researchers John Ford and Debbie Kavanagh looking for Narwhal (Monodon monoceros) from kayak, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) researchers recording vocalizations, Baffin Island, Canada

Fred Bavendam / Unicornfish (Naso vlamingii) being cleaned by a Blue-streaked Cleaner Wrasse (Labroides dimidiatus), Bali, Indonesia

Flip Nicklin / Narwhal (Monodon monoceros) aerial view of a group of males, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) aerial view of male group, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros) group with tusks above surface, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) pod aerial, Baffin Island, Nunavut, Canada

Norbert Wu / Whitemargin Unicornfish (Naso annulatus) long horn has unknown function, Fiji

Flip Nicklin / Narwhal (Monodon monoceros) aerial view of five males swimming near water surface, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros) surfacing, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) group at water surface

Flip Nicklin / Narwhal (Monodon monoceros) pair surfacing, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) fighting over carcass of dead female, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros)carcass with two tusks with Inuit hunter, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros) aerial view of five males swimming near water surface, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros) pod underwater

Flip Nicklin / Narwhal (Monodon monoceros) male surfacing, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) males fighting, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros) portrait

Flip Nicklin / Narwhal (Monodon monoceros) males dueling, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros) males fighting, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) two males fighting, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros) aerial of pod, Lancaster Sound, Canada

Flip Nicklin / Narwhal (Monodon monoceros) swimming near water's surface, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros) males underwater, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) mother and calf, Kaluctoo Bay, Canada

Flip Nicklin / Narwhal (Monodon monoceros) fighting males with crossed tusks, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros) males fighting, Canada

Flip Nicklin / Narwhal (Monodon monoceros) tail at sunset, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) tail, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) being hauled out by Inuits, Baffin Island, Canada

Jeff Rotman / Bluespine unicornfish fish face close-up (Naso unicornis) Red Sea.

Nick Groves / Footstool, Sefton, Unicorn, and Dilemma Mountains as seen from Empress Hut, Mount Cook National Park, New Zealand

Flip Nicklin / Narwhal (Monodon monoceros) with rare double tusks, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) group tusking, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) group in ice break, Baffin Island, Nunavut, Canada

Flip Nicklin / Inuit researcher using hydrophone to record Narwhal (Monodon monoceros) vocalizations under the arctic ice, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros) group in ice break

Flip Nicklin / Narwhal (Monodon monoceros) portrait, underwater

Flip Nicklin / Narwhal (Monodon monoceros) two males fighting, Baffin Island, Nunavut, Canada

Flip Nicklin / Narwhal (Monodon monoceros) aerial of six males swimming near water surface, Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros), Baffin Island, Canada

Flip Nicklin / Narwhal (Monodon monoceros) two tusking males, Baffin Island, Nunavut, Canada