This pigeon belongs to the kingdom Animalia. The organisms in this kingdom are multicellular, eukaryotic, and most have a fixed body plan as they develop. All animals are heterotrophs, meaning they must consume other organisms or their products to obtain energy (animals cannot create their own food like plants can). Various subgroups of animals include birds (the pigeon pictured is a bird), reptiles, amphibians, mammals, insects, and fish. All animals also have the ability to move freely and independently. The cells in animals have neither cell walls nor chloroplasts, but an extracellular matrix, tight junctions, gap junctions, and desmosomes are exclusive to the kingdom Animalia. Humans are included in this kingdom.