ABOUT ANIMALS
Animal, (kingdom Animalia), any of a group of multicellular eukaryotic organisms (i.e., as distinct from bacteria, their deoxyribonucleic acid, or DNA, is contained in a membrane-bound nucleus). They are thought to have evolved independently from the unicellular eukaryotes.
Animals evolved from unicellular eukaryotes. The presence of a nuclear membrane in eukaryotes permits separation of the two phases of protein synthesis: transcription (copying) of deoxyribonucleic acid (DNA) in the nucleus and translation (decoding) of the message into protein in the cytoplasm. Compared to the structure of the bacterial cell, this gives greater control over which proteins are produced. Such control permits specialization of cells, each with identical DNA but with the ability to control finely which genes successfully send copies into the cytoplasm.
Animals are classified based on their characteristics. They are eminent from algae, plants, and fungus where rigid cell walls are absent. Some are also heterotrophic, in general, they digest their food within the internal chambers which again distinguish them from algae and plants. Another elite character of these species is that they are motile, except in certain life stages.
Animals are an essential part of this ecosystem as they help in balancing the ecosystem. There are over 7 million animal species found in the world. The entire species of animals are divided into 5 types: Mammals, birds, reptiles, amphibians, and insects.
The official mammal class is Mammalia. Animals that are considered mammals include warm-blooded vertebrates that have hair or fur and whose babies drink milk.
Fish generally always remain in the water, whether fresh, brackish, or salt. Instead of lungs, fish breathe through gills, enabling them to absorb oxygen contained in the water itself. Note that some animals who spend their lives in the ocean—such as whales and dolphins—are not fish, but mammals, since they breathe air with lungs and provide milk for their young.
Animals has no restriction on the maximum length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental details and/or method of study, must be provided for research articles. Articles submitted that involve subjecting animals to unnecessary pain or suffering will not be accepted, and all articles must be submitted with the necessary ethical approval (please refer to the Ethical Guidelines for more information). Animals does not publish articles describing the use of animals solely to provide information of relevance to humans, e.g. for development of human medicines.
Invertebrates have nervous systems that are made up of fewer neurons than those of vertebrates, but this does not mean the nervous systems of invertebrates are simplistic. Invertebrate nervous systems are efficient and highly successful at solving the problems of survival these animals face.
