Boxer crab - also know as Lybia tessellata. These are small crabs found in shallow parts of the Indo-Pacific ocean. They are herbivores, thus, they eat both plants and animals. They prey for their food by using anemous to mop any surfaces.
They have a symbiotic relationship with anemous, they carry them not only to use them to scavenge for food. But, also to defend them from danger, they do this by punching the anemous towards the predator.
The anemous benefits from this relationship as they are also being fed.