sturgeonShortnose sturgeon have made a surprise recovery in New York City’s Hudson River, a new study shows. More than 60,000 occupy the river, greater by about four times than the number in 1970. The sturgeon comeback has been "so successful" that it may become one of the few species resurrected from the U.S. endangered species list — "becoming the first fish to do so." (Nat’l Geographic News)

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