All photographs copyright (2003-2013) by Kris H. Light

<strong>Freshwater Snails </strong>
Gastropods

Different types of Freshwater snails can different levels of pollution in their water sources. An easy way to tell how tolerant they are is to look at the opening of the shell. Hold up a shell by the p...
Freshwater Snails
Gastropods

Different types of Freshwater snails can different levels of pollution in their water sources. An easy way to tell how tolerant they are is to look at the opening of the shell. Hold up a shell by the pointed end, if the opening is on the left side, the snail can more easily tolerate pollution. "Right-handed" snails must have cleaner water.These snails graze algae on rocks and stream beds.
I tease my students by telling them to watch out for the "killer snails" when we go to the creek for the Stream Ecology class. Several years ago during science camp we had a very "active" student who was always getting into predicaments. During that class he came up to me with blood and water dripping from his hand to his elbow. "What happened to you?!", I asked. "I cut it on a snail!", he answered. "How in the world did you cut yourself on a snail?", I asked in amazement. "I slipped and fell on its (upward pointing) shell!", he replied.

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