 In the mangrove in Ha Pak Nai live various species, which is highly conserved by environmentalists.Crabs, for example, Perisesarma bidens, Ilyoplax tansuiensis, Uca arcuata, and Sesarma sinensis are commonly found in the offshore mud flat.Among all crabs found in the Ha Pak Nai area, Horseshoe crab is one of the most highly conserved species.