Luis Quinta / Imperial blackfish (Schedophilus ovalis) sheltering under discarded fishing ropes drifting off Pico island, Azores, Portugal, May.

Franco Banfi / Loggerhead sea turtle (Caretta caretta) accompanied by Imperial blackfish (Schedophilus ovalis) swimming, Vulnerable (IUCN). Azores, Atlantic Ocean.

Franco Banfi / Loggerhead sea turtle (Caretta caretta) accompanied by Imperial blackfish (Schedophilus ovalis) and Pilot fish (Naucrates ductor) Vulnerable (IUCN). Azores, Atlantic Ocean.

Sergio Hanquet / Mutualism between a Portuguese man o' war (Physalia physalis) and a juvenile Imperial blackfish (Schedophilus ovalis), Tenerife, Canary Islands.

Sergio Hanquet / Mutualism between a Portuguese man o' war (Physalia physalis) and a juvenile Imperial blackfish (Schedophilus ovalis), Tenerife, Canary Islands.

Sergio Hanquet / Mutualism between a Portuguese man o' war (Physalia physalis) and juvenile Imperial blackfish (Schedophilus ovalis), Tenerife, Canary Islands.

Sergio Hanquet / Imperial blackfish (Schedophilus ovalis) sheltering among discarded ropes, Canary Islands, Atlantic Ocean, May.