The Lake Winnipeg physa is a tiny freshwater snail whose restricted range makes it vulnerable to habitat changes.

Researchers discovered that Banff Springs physas are more sensitive to water temperature changes than previously thought.

Great Lakes physas often cling to submerged vegetation in shallow bays, making them important indicators of freshwater ecosystem health.

Researchers found that Lake Winnipeg physas play a subtle but important role in controlling algae growth along the shoreline.

Conservationists are racing to protect the Banff Springs physa after surveys showed its numbers have plunged.

Conservationists surveyed Fish Lake physas to assess the population after the drought.

Researchers studying freshwater biodiversity discovered that the Great Lakes physa prefers shallow, vegetated bays.