Multicellular animals are organisms made up of many cells that work together to perform various functions. These cells are specialized, meaning they have different roles, such as muscle cells for movement and nerve cells for communication. Examples of multicellular animals include humans, dogs, and fish. These animals typically have complex structures, including tissues and organs, which allow them to carry out essential life processes. Multicellular animals can be found in diverse environments, from oceans to forests, and they play important roles in their ecosystems, contributing to the balance of nature.