How do parasites get its offspring into new host?

Different types of parasites have their own ways of spreading their offspring. Many intestinal parasites spread their offspring to other animals by laying eggs in the fesces. After the fesces are eliminated, other animals can inhale the eggs from the fesces, and then the parasites will hatch out of the eggs inside the new host. They can also spread from a prey animal to a predator when the former is consumed.

BTW: Although the term "parasite" usually refers to parasitic worms in an animal's digestive tract, the technical definition of "parasite" is any organism that gains from another organism, causing harm to the other organism in the meantime.