Coconut Octopus (Amphioctopus marginatus)
The coconut octopus has been observed to carry shells as camouflage.
Every couple of meters, the octopus hides itself between the two shells and assesses its safety, before going on. While moving, it carries the shell with its inner suction cups and walks across the seafloor on the tips of its tentacles.
Some scientists consider this the use of tools.