It is the association in which only one species (tenant) benefits by seeking shelter or support in the body of another species (host) without harming it.
It is an association similar to commensalism, not involving food. Examples:
- Garfish and Holoturia - Gar has a thin and elongated body and protects against the action of predators sheltering inside the holoturias (sea cucumbers) without harming them.
- Epiphytism - Epiphytes (epi, top) are plants that grow on larger trunks without parasitizing them. Epiphytes are orchids and bromeliads that, living on trees, obtain a greater supply of sunlight.