What is the biological diversity of animals who require cairns for their propagation?

There isn't a specific category of animals that *require* cairns for their propagation. Cairns, which are piles of rocks, are not a natural habitat that animals depend on for breeding.

However, some animals may use cairns for:

* Shelter: Cairns can provide shelter from predators or harsh weather conditions.

* Nesting: Certain species may use the spaces between rocks in cairns to build nests.

* Territorial markings: Some animals may deposit scent or urine on cairns to mark their territory.

Examples:

* Lizards: Some lizards may utilize spaces within cairns for shelter or to lay their eggs.

* Snakes: Snakes might use cairns for shelter and to ambush prey.

* Small mammals: Small rodents may utilize cairns for shelter and nesting.

* Birds: Some birds may build nests near cairns for camouflage or protection.

It's important to note that the use of cairns by animals is often opportunistic, meaning they will utilize them if available but don't rely on them for survival.

Therefore, there's no specific biological diversity associated with animals that rely on cairns for their propagation. Instead, cairns can be a valuable resource for various species, contributing to the overall biodiversity of an area.