Lumbricus terrestris - Wikipedia
3 ways to measure your earthworm numbers - Farmers Weekly
Earthworms can be divided - Earthworm Society of Britain
The second wave of earthworm invasions in North America: biology
Three new “caecate” earthworm species from Sulawesi, Indonesia
Meet the earthworm CSI & discover how worm DNA can help soil
Earthworm diversity Earthworm Society of Britain
Know your worms in 30 mins - Crop Production Magazine
Earthworms - External features, diet, reproduction - Teaching Wiki
Lumbricus terrestris – 10,000 Things of the Pacific Northwest
The wonderful ways of worms – small world
Earthworm Watch Natural History Museum