Insect and animal bites & strings vary in severity. Certain types of bites and stings, such as mosquitoes, bees, ants, and flies are difficult to avoid. Venomous bites, such as those from spiders and snakes, may produce more severe reactions. However, these types of bites are usually treatable and not life-threatening in the majority of cases. The Bites & Stings center provides comprehensive physician-approved medical information on a variety of different types of Insect and animal bites & strings in the United States and around the world.