Volvation

Among mammals, vertebrates like pangolins (Manidae) and hedgehogs (Erinaceidae) exhibit the ability to conglobate.

Among pill millipedes, volvation is both a protection against external threats and against dehydration.

[3] Woodlice or pillbugs (Armadillidae) curl themselves into "pills" not only for defense, but also to conserve moisture while resting or sleeping, because they must keep their pseudotrachaea ("gills") wet.

[4] Multi-shelled chitons also volvate, although evidence suggests that they do not use this behavior as an anti-predatory defense but rather as a form of locomotion.

[1] In vertebrates, an animal's decision to volvate is mediated by the periaqueductal gray region.