Biting

[1] It is a common zoological behavior, being found in toothed animals such as mammals, reptiles, amphibians, fish, and arthropods.

[2] Biting is one of the main functions in the lives of larger organisms, providing them the ability to forage, hunt, eat, build, play, fight, protect, and much more.

[3] Bites often result in serious puncture wounds, avulsion injuries, fractures, hemorrhages, infections, envenomation, and death.

[5] Some other species that may bite humans include urban animals such as feral cats, spiders, and snakes.

An example of this is shown by the broad, serrated teeth of great white sharks which prey on large marine animals.

[2] On the other hand, herbivores have rows of wide, flat teeth to bite and chew grass and other plants.

Many snakes carry a venomous saliva containing at least one of the major groups of toxins, which include cytotoxins, hemotoxins, myotoxins, and neurotoxins.

[12] Spider venom polypeptides target specific ion channels, which excites components of the peripheral, central and autonomic nervous systems, causing hyperactive neurotransmitter release and subsequently refractory paralysis.

Mosquito bites may cause allergic wheals that are itchy and may last a few days; in some areas, they can spread blood-borne diseases (e.g. malaria and West Nile fever) via transmission of protozoic or viral pathogens.

Infections are a result of bacteria from the mouth spread to another human and are the third common types of bites that require a hospital visit.