Want to see something amazing? Watch this video of octopuses carrying coconuts then using them as shields to protect themselves. According to National Geographic:

The coconut-carrying behavior makes the veined octopus the newest member of the elite club of tool-using animals—and the first member without a backbone, researchers say.

[…]

An octopus would dig up the two halves of a coconut shell, then use them as protective shielding when stopping in exposed areas or when resting in sediment.

This, on its own, astonished the team. Then they noticed that the octopuses, after using the coconut shells, would arrange them neatly below the centers of their bodies and “walk” around with the shells—awkwardly.