Glow-in-the-dark animals? It may sound like science fiction, but they've been around for years. Cabbages that produce scorpion poison? It's been done. Oh, and the next time you need a vaccine, the doctor might just give you a banana. These and many other genetically modified organisms exist today because their DNA has been altered and combined with other DNA to create an entirely new set of genes. You may not realize it, but many of these genetically modified organisms are a part of your daily life — and your daily diet. In 2015, 93 percent of U.S. corn and soybeans are genetically engineered, and it's estimated that 60 to 70 percent of processed foods on grocery store shelves contain genetically engineered ingredients. Here’s a look at the some of the weirdest genetically engineered plants and animals already in existence — and many that are coming your way soon.

1 of 12 Glow-in-the-dark animals Photo: SAM YEH/AFP via Getty Images In 2007, South Korean scientists altered a cat's DNA to make it glow in the dark and then took that DNA and cloned other cats from it — creating a set of fluffy, fluorescent felines. Here’s how they did it: The researchers took skin cells from Turkish Angora female cats and used a virus to insert genetic instructions for making red fluorescent protein. Then they put the gene-altered nuclei into the eggs for cloning, and the cloned embryos were implanted back into the donor cats — making the cats the surrogate mothers for their own clones. Earlier research in Taiwan created three pigs that glowed fluorescent green. That's Wu Shinn-chih, assistant professor for the Institute and Department of Animal Science and Technology of National Taiwan University (NTU), with one of the pigs in the photo. What's the point of creating a pet that doubles as a nightlight? Scientists say the ability to engineer animals with fluorescent proteins will enable them to artificially create animals with human genetic diseases.

2 of 12 Enviropig Photo: Budimir Jevtic/Shutterstock The Enviropig, or "Frankenswine," as critics call it, is a pig that's been genetically altered to better digest and process phosphorus. Pig manure is high in phytate, a form of phosphorus, so when farmers use the manure as fertilizer, the chemical enters the watershed and causes algae blooms that deplete oxygen in the water and kill marine life. So scientists added an E. coli bacteria and mouse DNA to a pig embryo. This modification decreases a pig's phosphorous output by as much as 70 percent — making the pig more environmentally friendly.

4 of 12 Venomous cabbage Photo: Kawongwarin/Shutterstock Scientists have taken the gene that programs poison in scorpion tails and looked for ways to combine it with cabbage. Why would they want to create venomous cabbage? To limit pesticide use while still preventing caterpillars from damaging cabbage crops. These genetically modified cabbages would produce scorpion poison that kills caterpillars when they bite leaves — but the toxin is modified so it isn’t harmful to humans.

5 of 12 Web-spinning goats Photo: Gorynvd/Shutterstock Strong, flexible spider silk is one of the most valuable materials in nature, and it could be used to make an array of products — from artificial ligaments to parachute cords — if we could just produce it on a commercial scale. In 2000, Nexia Biotechnologies announced it had the answer: a goat that produced spiders' web protein in its milk. Researchers inserted a spiders’ dragline silk gene into the goats’ DNA in such a way that the goats would make the silk protein only in their milk. This "silk milk" could then be used to manufacture a web-like material called Biosteel.

6 of 12 Fast-growing salmon Photo: J LEVIN W [CC BY-SA 4.0] /Wikimedia Commons AquaBounty's genetically modified salmon grows twice as fast as the conventional variety — the photo shows two same-age salmon with the genetically altered one in the rear. The company says the fish has the same flavor, texture, color and odor as a regular salmon; however, the debate continues over whether the fish is safe to eat. Genetically engineered Atlantic salmon has an added growth hormone from a Chinook salmon that allows the fish to produce growth hormone year-round. Scientists were able to keep the hormone active by using a gene from an eel-like fish called an ocean pout, which acts as an "on switch" for the hormone. The FDA approved the sale of the salmon in the U.S. in 2015, marking the first time a genetically modified animal was approved for sale in the U.S.

7 of 12 Flavr Savr tomato Photo: fotomanX/Shutterstock The Flavr Savr tomato was the first commercially grown genetically engineered food to be granted a license for human consumption. By adding an antisense gene, the California-based company Calgene hoped to slow the ripening process of the tomato to prevent softening and rotting, while allowing the tomato to retain its natural flavor and color. The FDA approved the Flavr Savr in 1994; however, the tomatoes were so delicate that they were difficult to transport, and they were off the market by 1997. On top of production and shipping problems, the tomatoes were also reported to have a very bland taste: "The Flavr Savr tomatoes didn’t taste that good because of the variety from which they were developed. There was very little flavor to save," said Christ Watkins, a horticulture professor at Cornell University.

8 of 12 Banana vaccines Photo: vincentchuls/Shutterstock People may soon be getting vaccinated for diseases like hepatitis B and cholera by simply taking a bite of banana. Researchers have successfully engineered bananas, potatoes, lettuce, carrots and tobacco to produce vaccines, but they say bananas are the ideal production and delivery vehicle. When an altered form of a virus is injected into a banana sapling, the virus' genetic material quickly becomes a permanent part of the plant's cells. As the plant grows, its cells produce the virus proteins — but not the infectious part of the virus. When people eat a bite of a genetically engineered banana, which is full of virus proteins, their immune systems build up antibodies to fight the disease — just like a traditional vaccine.

9 of 12 Less-flatulent cows Photo: smereka/Shutterstock Cows produce significant amounts of methane as a result of their digestion process — it’s produced by a bacterium that’s a byproduct of cows’ high-cellulosic diets that include grass and hay. Methane is a major contributor — second only to carbon dioxide — to the greenhouse effect, so scientists have been working to genetically engineer a cow that produces less methane. Agriculture research scientists at the University of Alberta have identified the bacterium responsible for producing methane and designed a line of cattle that creates 25 percent less methane than the average cow.

11 of 12 Medicinal eggs Photo: maradon 333/Shutterstock British scientists have created a breed of genetically modified hens that produce cancer-fighting medicines in their eggs. The animals have had human genes added to their DNA so that human proteins are secreted into the whites of their eggs, along with complex medicinal proteins similar to drugs used to treat skin cancer and other diseases. What exactly do these disease-fighting eggs contain? The hens lay eggs that have miR24, a molecule with potential for treating malignant melanoma and arthritis, and human interferon b-1a, an antiviral drug that resembles modern treatments for multiple sclerosis.