They're also found in Europe, the Mediterranean area, Asia, and Africa. Caecilians, wormlike amphibians lacking legs, are more limited in their range, found in Central and South America, parts of Southeast Asia, and from India and Sri Lanka to the Philippines. Amphibians inhabit many different ecosystems, including grasslands, rain forests, alpine areas and conifer forests, even deserts, although most need freshwater habitats such as swamps and streams, or other wet environments for breeding. Invertebrates are the majority of the animal kingdom. Deep-sea collecting techniques show enormous biodiversity on the ocean floors, comprised mostly of invertebrates numbering in the tens of millions.
Sponges are animals which live at the bottom of our oceans and other bodies of water.
They spend their lives attached to rocks, plants, and other objects beneath the water's surface. Sponges cannot move about and were once thought of as plants, but since they do not manufacture their own food but must eat, they are classified as animals. There are over 5,000 species of sponges inhabiting oceans and fresh water bodies from warm shallow to cold deep waters. Coral is the limestone formation we often see as reefs, like the Great Barrier Reef of Australia, and is formed by millions of tiny animals. Coral formations may also take on the appearance of branching trees, domes or organ pipes.