Spider behavior Spider behavior Spider behavior refers to the range of behaviors and activities performed by spiders. Spiders are air-breathing arthropods that have eight legs and chelicerae with fangs that inject venom. They are the largest order of arachnids and rank seventh in total species diversity among all other groups of organisms which is reflected in their large diversity of behavior. Almost all known spider species are predators, mostly preying on insects and on other spiders, although a few species also take vertebrates such as frogs, lizards, fish, and even birds and bats. Spiders' guts are too narrow to take solids, and
Parasitic flies of domestic animals transmitted organisms to develop, multiply and be exposed to further vertebrate hosts where they can complete their life cycle. Only the adult flies are involved in this biological transmission, in contrast to biological transmission by other arthropods such as lice or ticks in which all active stages of the life-cycle feed on blood. Typical genera are "Culex", "Aedes", and "Anopheles". The basic structure of dipteran flies is illustrated in the diagram. Veterinary parasitology also covers arthropods in the Class Acari, the ticks of domestic animals and mites of livestock which have distinctly different structure from arthropods in the Class Insecta.