Oviparous animals are animals that lay their eggs, with little or no other embryonic development within the mother. This is the reproductive method of most fish, amphibians, reptiles, all birds, and the monotremes.

In traditional usage, most insects, molluscs, and arachnids are also described as oviparous.

'Helix pomatia', common names the Roman snail, is a species of large, edible, air-breathing land snail, a pulmonate gastropod terrestrial mollusc in the family Helicidae. It is a European species. Although this species is highly prized as a food, it is difficult to cultivate and rarely farmed commercially.

This snail is hermaphroditic. Reproduction in central Europe begins at the end of May. Eggs are laid in June and July, in clutches of 40–65 eggs. The size of the egg is 5.5–6.5 mm or 8.6 × 7.2 mm. Juveniles hatch after three to four weeks and may consume their siblings under unfavourable climate conditions. Maturity is reached after two to five years. The life span is up to 20 years, but snails die faster often because of drying in summer and freezing in winter. The maximum lifespan is 35 years.

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