Size

• Dillies are about 2 to 4 inches in length, while Canadian nightcrawlers used as bait usually run 5 to 8 inches.
  
  

Function

• Dillies (also known as dillys) are used to catch trout, sunfish and bluegills, while nightcrawlers can be used to catch these and catfish and pike as well.
  
  

Geography

• Often called Canadian nightcrawlers, Lumbricus terrestris can be picked off fields and lawns in the northeastern United States. Night pickers harvest them commercially in Ontario, Canada.
  
  

Cost

• Nightcrawlers typically cost between $2.50 and $3.50 per dozen, while a cup of 15 dillies might run the same.
  
  

Fun Fact

• Canada exports about $20 million worth of nightcrawlers to the United States annually.