Xingu River ray mostly brownish-dusky (large white center to underparts of "P. henlei"). Compared to "P. albimaculata", "P. leopoldi" has fewer and larger yellowish-white spots above. Xingu River ray The Xingu River ray, white-blotched river stingray, or polka-dot stingray ("Potamotrygon leopoldi") is a species of freshwater fish in the family Potamotrygonidae. It is endemic to the Xingu River basin in Brazil and prefers rocky bottoms. It is sometimes kept in aquaria. "P. leopoldi" reaches up to in disc width, in total length and in weight. Females grow larger than males. It is closely related to the similar "P. henlei" from the Tocantins River
American River biodiversity of the American River. The American River is utilized for a variety of recreational uses. Locals and travelers alike use the river’s scenic landscape for bird watching, hiking, biking, fishing, river rafting, kayaking, and more. Although the American River allows small motor boats for part of the year, it remains free from speed boats or boats that use fuel, which makes it a clean, biodiverse river that people can safely swim in and do other recreational activities in. The American River is specifically known for its whitewater rafting. The South Fork has Class III rapids, the Middle Fork has