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The saw of the sawfish is actually an elongated and flattened snout lined with modified scales that look like teeth. The saw is covered with thousands of receptor cells called ampullae of Lorenzini that detect weak bioelectric fields generated by living tissues. When they detect a school of fish nearby, the sawfish will swim through the school swinging its snout back and forth, impaling the fish on the saw teeth. In the United States the smalltooth sawfish is mostly limited to waters off the coast of southwest Florida from Charlotte Harbor to Florida Bay. In 2003, the US listed the smalltooth sawfish as an endangered species, and in 2014 it added the remaining species of sawfish to the list. The decline in sawfish populations both in the US and worldwide are due to a combination of factors, including habitat loss (they breed and live in threatened habitats such as mangroves), entanglement in fishing line and nets, and use in traditional cuisine and medicines.