Answer: octopuses

AnswerCrossword Clue
OCTOPUSES

They have arms

OCTOPUSES

Army marine creatures?

OCTOPUSES

Cephalopods.

OCTOPUSES
Marine animals.
OCTOPUSES
Sea-bottom dwellers
OCTOPUSESFar-reaching companies
OCTOPUSESCreatures with three hearts
OCTOPUSESDeep-sea denizens
OCTOPUSESThey're well-armed
OCTOPUSESSome deep-sea denizens