Cephalapods are a group of marine mollusks that include octopuses, squid, cuttlefish, and nautilus. Their tentacles are used for a variety of purposes, including:
* Catching prey: Tentacles are covered in suckers that help them grab and hold onto food.
* Movement: Some cephalopods use their tentacles to propel themselves through the water.
* Defense: Tentacles can be used to ward off predators or to inject venom.
* Sensing the environment: Tentacles have sensory organs that help them detect changes in their surroundings.
So, while you might think of tentacles as being unique to octopuses, they're actually a defining characteristic of the entire cephalopod family!