While most animals are motile, meaning they can move independently, there are some exceptions.
Examples of animals that are not motile at any stage of their lives include:
* Sponges: These simple animals are filter feeders that attach themselves to surfaces and remain stationary throughout their lives.
* Corals: These are colonial animals that live in fixed positions and only move during their larval stage.
* Barnacles: These crustaceans attach themselves to rocks, ships, and other surfaces and remain immobile for most of their lives.
It's important to note that:
* Motility can vary depending on the life stage. Some animals, such as barnacles, are motile during their larval stage but become immobile as adults.
* Some animals are only motile for a short period. For example, some parasites may be motile only during their larval stage or when they need to move to a new host.
Therefore, while most animals exhibit some degree of motility during their lives, there are certain exceptions that remain stationary throughout their entire existence.