As far as pearls are concerned, "feeding" refers to the process in which the mother mussel breeds pearls in the body. Specifically, when the mother mussel eats sand or stones containing shellfish larvae, these larvae will form pearl sacs in the mother mussel, and the mantle cells in the pearl sacs will secrete nacre, which will wrap the larvae layer by layer and eventually form pearls. Therefore, "feeding" refers to the process of mother mussels giving birth to pearls through their own physiological functions.

As far as river crabs are concerned, "feeding" usually refers to the process in which female river crabs hatch and protect their eggs and larvae. When the ovaries of female river crabs mature, they will lay eggs on the abdominal limbs of the abdomen, and then protect their larvae by hatching until they can live independently. In this process, the mother crab will constantly adjust the posture and breathing state of the larvae to provide enough oxygen and nutrition to avoid the death of the larvae due to excessive pressure. Therefore, "feeding" refers to the process that female river crabs feed their offspring by hatching eggs and protecting their larvae.