crabs and sea snails crawling on wet muddy land in mangrove fore

animal aquatic asia blue brown cerithidea claw coastal conservation crab crabs crawl creature creeper crustacean ecology ecotourism female fiddler food forest gastropod hermit hole horn land legs low mangrove mederi mollusk mud muddy natural nature obtuse reserve sea sesarma shell shore small snail snails swamp thailand tidal tide tropical water wet wetland