Red wigglers are a type of earthworm known scientifically as Eisenia fetida. They are commonly used in composting because they thrive in decaying organic matter, helping to break it down into nutrient-rich compost. These worms are small, typically measuring about 3 to 4 inches long, and have a reddish-brown color. These worms are particularly effective in vermiculture, a method of composting that uses worms to recycle organic waste. Red wigglers can consume their weight in food each day, making them efficient decomposers. They prefer moist environments and can be found in compost bins or piles, where they contribute to soil health.