Also known as Achatina fulica, the Giant African snail is the largest species of snail found on land. Giant African snails have both male and female reproductive organs, meaning they have both testes and ovaries and are able to produce sperm and ova. Although these snails generally mate with one another, they are capable of reproducing by themselves. Self-fertilization is very rare and only happens in small populations. They lay about 6 clutches of eggs per year, averaging about 200 eggs per clutch. Snails of similar size will transfer gametes to each other, but snails of different size will mate unilaterally, with the larger snail acting as a female. Courtship can last up to half an hour and the transfer of gametes can last for two hours.
This picture shows two Giant African snails while mating, where they take on both the male and female roles.