Snails reproduce by inseminating each other with sperm. Once this sperm is collected, it internally fertilizes the ova. A hundred eggs may develop from a single reproductive effort.
Snails are hermaphrodites; they produce both ova and spermatozoa. A small opening near the front of a snail's body allows the outer reproductive organs to extrude, faciliating the sperm exchange. Once fertilization occurs internally, eggs develop. Snails bury their eggs in shallow, warm, damp dirt about 2 to 4 inches deep. The eggs hatch about a month after burial. Snails often lay eggs once a month. They begin the mating process when they are about a year old.