This large snail lives only in freshwater: it prefers slowly running water, and standing water bodies. "Lymnaea stagnalis" is a simultaneously hermaphroditic species and can mate in the male and female role, but within one copulation only one sexual role is performed at a time. "Lymnaea stagnalis" perform more inseminations in larger groups and prefer to inseminate novel over familiar partners. Such higher motivation to copulate when a new partner is encountered is known as the Coolidge effect and has been demonstrated in hermaphrodites firstly in 2007. "Lymnaea stagnalis" is an intermediate host for:  Other parasites of "Lymnaea stagnalis" include:  "Lymnaea stagnalis" has been experimentally infected with "Elaphostrongylus rangiferi". This article incorporates CC-BY-2.0 text from references and CC-BY-2.5 text from the reference