If you’ve seen the groups of tiny, pretty pink eggs sticking to things in your yard or near water, you might think they are harmless or the symbol of a party. On the other hand, the apple snail, a watery mollusk that is spreading around the world, is hurting ecosystems everywhere. These beautiful eggs are clear signs that an Apple snail invasion has begun. Apple snails are a species of pond snail. This species comes from South America and has spread very far, causing major problems for wildlife, aquatic plants, and cattle wherever it has settled. It might have come from South America. Its roots may go all the way back to South America.