The category "Animals Subcategories Bivalves" refers to a group of marine or freshwater animals that are part of the larger Mollusks classification. These creatures, known as Bivalves, are characterized by a two-part, hinged shell, encompassing species such as clams, oysters, scallops, and mussels. Despite being distinct from Amphibians, they are all part of the comprehensive Animals kingdom, demonstrating the diversity of life forms within it.