A living organism belonging to the kingdom Animalia .
Animals are typically mobile and feed on plants , other animals, or their remains.
Their body cells lack the rigid cellulose wall of plant cells and they require specialized tissues, such as bone, for protection and support. There are over one million species of animals, grouped into over 30 phyla. The Macmillan Encyclopedia 2001 2. The New Penguin Dictionary of Science 4. Taxonomy Penguin Dictionary of Sociology 5.