Neutrally buoyant, they have several observed types of mobility. Flapping their Dumbo ear-like fins gets them moving with peculiar grace and ease. Expanding and contracting the webbing between their tentacles or by shooting water through their funnel cause a sudden thrust, useful for escaping a predator. Any of these methods for movement can be used separately or simultaneously. These octopus can also do the more ordinary octopus movements such as crawling on their tentacles.