Some species are found under rocks in the lower intertidal and shallow subtidal zones. This includes environments such as supratidal zones, littoral or intertidal zones, and most importantly estuarine. Sediment often settles in intertidal mudflats which are extremely difficult to colonize. They are found in habitats ranging from shallow intertidal areas to abyssal depths. Sanderlings feed on invertebrate prey buried in the sand in the upper intertidal zone. Marine mussels are abundant in the low and mid intertidal zone in temperate seas globally. This is the first project in Asia located on intertidal mudflats. The approximately fortnightly tidal cycle has large effects on intertidal and marine organisms. Many land animals also make much use of the shore and intertidal habitats. Barren zones extend from the lowest portion of the intertidal zone to the marsh areas. There is strong biological diversity, including intertidal vegetation like freshwater cattails and saltwater cordgrasses. True limpets in the family Patellidae live on hard surfaces in the intertidal zone. Cutaneous respiration occurs in a variety of marine, intertidal, and freshwater fish. Recently transformed juveniles settle onto shallow intertidal beaches. However, some articulate species attach to kelp or in exceptionally sheltered sites in intertidal zones.