Wikipedia:Main Page history/2022 April 23b
From today's featured articleThe American paddlefish (Polyodon spathula) is a smooth-skinned ray-finned freshwater fish that is the only living species of the paddlefish family. The fish is often considered a relict species as it retains some morphological traits of its early ancestors, including a mostly cartilaginous skeleton and a paddle-shaped rostrum extending from its cranium for roughly one-third its body length. It is also considered a highly derived fish due to its novel adaptations, such as filter feeding. The planktivorous fish averages 5 ft (1.5 m) in length, and has a heterocercal tail fin resembling that of sharks. It is native to the Mississippi River basin, with a range extending to the Great Lakes, but is now considered vulnerable due to overfishing, poaching, habitat destruction, and pollution, and its naturally occurring populations have died off in most of its peripheral range, including New York and Pennsylvania. (Full article...)
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On this dayApril 23: National Sovereignty and Children's Day in Turkey (1920)
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The blue-sided leaf frog (Agalychnis annae) is a species of tree frog in the family Phyllomedusidae native to the tropical rainforests of Central America. It is known only from the Central Valley of Costa Rica, on the slopes of the Cordillera de Talamanca, the Cordillera de Tilarán and the Cordillera Central, at altitudes between 600 and 1,650 m (2,000 and 5,400 ft). The total extent of its range is estimated to be around 16,000 km2 (6,178 sq mi), and the International Union for Conservation of Nature has listed it as a vulnerable species. This photograph of a blue-sided leaf frog was captured in Heredia Province, Costa Rica, and was focus-stacked from two separate images. Photograph credit: Charles James Sharp
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