Marine Animals are a diverse group of aquatic organisms that inhabit the oceans and seas, including both vertebrates and invertebrates. This category encompasses amphibians, a class of cold-blooded vertebrates that includes frogs and salamanders, which are unique for their ability to live both in water and on land, and their distinctive reproductive methods involving a water-based larval stage. It also includes mollusks, a large phylum of invertebrates with a soft unsegmented body usually enclosed in a calcareous shell, such as snails, clams, and squids. Overall, the category of Marine Animals covers a wide range of species, all sharing the common trait of relying on marine or aquatic environments for their survival.