Africanized Bees - Africanized honey bees, known colloquially as "killer bees", are a hybrid variety of the European honeybee (Apis mellifera), generated by a man-made breeding of the African honey bee, A. m. scutellata, with various European honey bees such as the Italian bee A. m. ligustica and A. m. iberiensis. These bees are far more aggressive than the European subspecies. Source: Wikipedia

The American cockroach (Periplaneta americana), also known as the waterbug, or misidentified as the palmetto bug, is the largest species of common cockroach, and often considered a pest. The insect can travel quickly, often darting out of sight when someone enters a room, and can fit into small cracks and under doors despite its fairly large size. It is considered one of the fastest running insects. Source: Wikipedia

The German cockroach (Blattella germanica) is a small species of cockroach, measuring about 0.51 in to 0.63 in long. The German cockroach is the number 1 pest roach in the World, and found to be hardest to control. These insects are particularly associated with restaurants, food processing facilities, hotels, multi-family housing and nursing homes. Source: Wikipedia

The Argentine ant, Linepithema humile, (also known as Fire Ant) is a dark ant native to northern Argentina, Uruguay, Paraguay, and southern Brazil. It is an invasive species that has been established in many Mediterranean climate areas, inadvertently introduced by humans to many places around the world, Including the United States.The ants are among the world's 100 worst animal invaders. Source: Wikipedia

The yellow crazy ant (Anoplolepis gracilipes) is a species of ant that has wreaked ecological damage around the world. It is called "crazy" because of its erratic movements when disturbed. Long legs and antennae make it one of the largest invasive ant species in the world. The yellow crazy ant is one of the 5 species of tramp ants, known for invasive behavior and devastating ecological effects. Source: Wikipedia

Centruroides is a genus of scorpions belonging to the family Buthidae. The North American species are known by the common name bark scorpion. Found throughout the southern United States, they are known for their fluorescence under ultraviolet light, except after molting. There are several highly venomous species, and fatalities are known to occur. Source: Wikipedia

Hoffmannius spinigerus, commonly known as the stripe-tailed scorpion or the "devil" scorpion, is very common to the desert Southwest including Las Vegas. Like all scorpions, Hoffmannius spinigerus is venomous; however the venom of this species is not medically significant for humans or other mammals and is not considered as dangerous as some other scorpion venoms. Source: Wikipedia

Bed bugs are small, brownish, flattened insects that feed solely on the blood of animals. The common bed bug, Cimex lectularius, is the species most adapted to living with humans. Adult bed bugs are about 3/16-inch long and reddish-brown, with oval, flattened bodies. They are sometimes mistaken for ticks or cockroaches. Bed bugs do not fly, but can move rapidly over floors, walls, ceilings and other surfaces. Source: University of Kentucky College of Agriculture

The black widow spiders are perhaps the best-known members of the genus Latrodectus . The injection of neurotoxic venom latrotoxin from these species is a comparatively dangerous spider bite, resulting in the condition latrodectism, named for the genus. The female black widow's bite is particularly harmful to humans because of its unusually large venom glands. Source: Wikipedia

The recluse spiders or brown spiders (genus Loxosceles) are a venomous genus of spiders known for their necrotic bite, which sometimes produces a characteristic set of symptoms known as Loxoscelism. Loxosceles spiders have potent tissue-destroying venoms containing the dermonecrotic agent, sphingomyelinase D, which is otherwise found only in a few pathogenic bacteria. Source: Wikipedia

As suggested by the bat’s name Brown Bat, its fur is uniformly dark brown and glossy on the back and upper parts with slightly paler, greyish fur underneath. It is becoming a nuisance in the Desert Southwest, due to its daytime roosting habits, e.g. gaining access to roofs and attics for roosting.  In addition to aesthetic concerns, the roosting areas may accumulate feces that carry bacteria. Source: Wikipedia

Crickets, family Gryllidae (also known as "true crickets"), are insects somewhat related to grasshoppers, and more closely related to katydids or bush cricket (family Tettigoniidae). They have somewhat flattened bodies and long antennae. Crickets are harmless to humans, but if trapped inside the walls of buildings, their chirping may become annoying to the habitants. Source: Wikipedia

House mice have an adult body length (nose to base of tail) 3.0–3.9 in and a tail length of 2.0–3.9 in. They vary in color from white to grey and light brown to black. House mice thrive under a variety of conditions: they are found in and around homes and commercial structures. House mice consume and contaminate food also transmit disease-causing pathogens and parasites. Source: Wikipedia

The black rat was one of the many species originally described by Linnaeus in his 18th century work, Systema Naturae, and it still bears its original name of Rattus rattus. It is the type species of the genus Rattus. Alternate names include ship rat, roof rat, house rat, Alexandrine rat, and old English rat. Rats transmit diseases because they have the ability to carry bacteria and viruses in their systems. Source: Wikipedia

A packrat, also called a woodrat, can be any of the species in the rodent genus Neotoma. Packrats have a rat-like appearance with long tails, large ears and large black eyes. Getting into everything from attics to car engines, stealing their ‘treasures’, damaging electrical wiring and creating general noisy havoc can easily cause them to become a nuisance. Source: Wikipedia

Pigeons and doves constitute the bird family Columbidae within the order Columbiformes, which include some 300 species of land birds. Pigeon detritus and especially pigeon faeces represent both an aesthetic and a public health problem. Pigeon droppings quickly deface finishes both to the inside and outside of buildings and are difficult and expensive to remove. Source: Wikipedia

Rattlesnakes are a group of venomous snakes of the genera Crotalus and Sistrurus of the subfamily Crotalinae ("pit vipers"). There are 32 known species of rattlesnake, all native to the Americas. They possess fangs used to  inject large quantities of hemotoxic venom to their prey. The venom destroys tissue, causing swelling, internal bleeding, and intense pain. Source: Wikipedia