Many orchids, bromeliads, ferns and mosses often grow as epiphytes. The mangrove branches and trunks support various epiphytes, such as bromeliads. Dense growths of epiphytes and mosses cover the trees, and lush vegetation is present everywhere. The most common epiphytes are ferns, astelias and orchids. The forests are thick with vines, ferns, epiphytes, and palms. It is inhabited by bamboo, pandan, orchids, ferns, pitcher plants and other epiphytes. Common houseplants are usually tropical or semi-tropical epiphytes, succulents or cacti. Browsers mainly feed on seagrasses and their epiphytes. Snail and nudibranch species are two common grazers of epiphytes. The second largest group are the leptosporangiate ferns, with about 2800 species (10% of epiphytes). Tamarin groups use hollow tree cavities, dense vines or epiphytes as sleeping sites. They are upright plants, epiphytes, or vines. The ecology of epiphytes in marine environments differs from those in terrestrial ecosystems. In tropical regions, some grow as forest climbers and epiphytes. "Anthurium" is a genus of herbs often growing as epiphytes on other plants.