Although whale sharks are massive, they are generally docile and inoffensive to humans. Whale sharks are even sometimes nice enough to let human swimmers hitch a ride.
Learn more about the Whale Shark.
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SnailsStatus/Date Listed as Endangered:
EN-US FWS: October 28, 1998
Area(s) Where Listed As Endangered:
The flat pebblesnail is an aquatic snail that is only found in the Cahaba River drainage in Alabama. Snails are mollusks that have coiled or spiral shells covering their soft bodies, and the shells get bigger toward the opening as they grow. Some aquatic snails may come to the water surface to get oxygen, which they can hold within the shell, and some have gills to extract oxygen from the water. No freshwater snail can live long term out of the water.
The flat pebblesnail can only thrive in a freshwater habitat and can be found in shoals, rapids and riffles or large streams and rivers. This species is more than likely herbivorous, feeding on algae and small pieces of dead or decaying plants in the water. All snails hibernate in the winter and they are “hermaphrodites,” possessing both male and female reproductive organs. A small slit appears on the neck where the fertilization occurs and the eggs develop. After hatching from the eggs, the larvae swim freely in the water and soon begin to grow a shell, which eventually weighs them down, making them pedestrian.
The flat pebblesnail has disappeared from more than 90% of its historic range, and the estimated population of the species is fewer than 1000 mature individuals. Causes of decline include impoundment, channelization, mining, dredging, and pollution. The species is now legally protected and a recovery plan has been developed by the US Fish & Wildlife service which includes the annual monitoring of the species and its habitat and establishing a captive population, later to be reintroduced into the wild.
Flat Pebblesnail Facts Last Updated: January 1, 2006
To Cite This Page:
Glenn, C. R. 2006. "Earth's Endangered Creatures - Flat Pebblesnail Facts" (Online).
Accessed 3/25/2017 at http://earthsendangered.com/profile.asp?sp=747&ID=9.