Drosophila melanogaster is commonly used for animal experimentation. Most animal testing involves<unk> , especially Drosophila melanogaster, a fruit fly, and Caenorhabditis elegans, a nematode. These animals offer scientists many advantages over vertebrates, including their short life cycle, simple anatomy and the ease with which large numbers of individuals may be studied.<unk>  are often cost-effective, as thousands of flies or nematodes can be housed in a single room. With the exception of some cephalopods in the European Union,<unk> species are not protected under most animal research legislation, and therefore the total number of<unk>  used remains unknown.
Animal testing on invertebrates
Animal testing on rodents
Animal testing on non-human primates
Laboratory developed test
WHO model list of essential in vitro diagnostics
Microscopic Observation Drug Susceptibility assay
Aquatic toxicology databases
Functional molecular infection epidemiology