Environment

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The ticket booths are empty and the gates are chained shut at an entrance to the Bronx Zoo in New York, Friday, Sept. 21, 2012. Zoo officials say a visitor who leaped into an exhibit and was mauled by a tiger was alone with the 400-pound beast for about 10 minutes before being rescued. (AP Photo/Jim Fitzgerlad)

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Washington Nationals center fielder Bryce Harper (34) warms up in the batters circle in the third inning. (Craig Bisacre/The Washington Times)

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Expected conflicts between wolves and humans and the amount of time required of park officials to manage a wolf population are among reasons the National Park Service hasn’t reintroduced the animal to control the elk population at Rocky Mountain National Park. Park staff and volunteers shoot excess elk instead. (Associated Press)

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The Rothschild Collection of patent models is on display at the Smithsonian American Art Museum through November 2013.

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The Rothschild Collection of patent models is on display at the Smithsonian American Art Museum through November 2013.

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An impala scampers over a hill in the Phinda Private Game Reserve, near the town of Hluhluwe, in Kwazulu-Natal province, South Africa. Phindaís luxury lodges are spread over 56,000 acres and seven habitats, from the savanna to the unique sand forest. (AP Photo/Matthew Craft)

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Three black rhinos graze on the savanna in the Phinda Private Game Reserve, near the town of Hluhluwe, in Kwazulu-Natal province, South Africa. (AP Photo/Matthew Craft)

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An adult vervet monkey holds a young one in the trees at Phinda Private Game Reserve, near the town of Hluhluwe, in Kwazulu-Natal province, South Africa. (AP Photo/Matthew Craft)

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Zebras graze in the Phinda Private Game Reserve in South Africa, where the animals roam freely and guests get close-up looks during four-hour game rides. (Associated Press)

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The living and dining areas are open to the kitchen, which has a center island and breakfast bar. Floor-to-ceiling windows flood the living area with natural light.

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Sequar Development, Ellisdale Construction & Development and Valor Development are building 31 condominiums at the Aston on 14th in the District. The homes have 558 to 953 finished square feet, with base prices from $279,900 to $659,900.

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Col. Chris Hall of the U.S. Army Corps of Engineers on Wednesday points to the damaged protection cell at Lock 27 on the Mississippi River. Barges are supposed to rub against the rock-filled steel cylinder to help align them for proper entry into the lock. As of Wednesday morning, nearly five dozen tugboats and more than 400 barges were caught up in the logjam, which comes amid the nation’s worst drought in decades. (Associated Press)

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Cars on Great River Road in Godfrey, Ill., pass the many barges and tugboats backed up on the Mississippi River on Wednesday as crews try to repair the river’s busiest lock. Workers closed Lock 27 on Saturday after discovering that a protection cell had split open and allowed rock to spill into the river, obstructing the passage. Roughly half of the nation’s farm exports pass through the lock near St. Louis. (Telegraph via Associated Press)

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Space shuttle Endeavour atop a modified jumbo jet makes its departure from the Kennedy Space Center, Wednesday, Sept. 19, 2012, in Cape Canaveral, Fla. Endeavour will make a stop in Houston before heading to the California Science Center in Los Angeles.(AP Photo/Terry Renna)

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Space shuttle Endeavour atop a modified jumbo jet makes its departure from the Kennedy Space Center, Wednesday, Sept. 19, 2012, in Cape Canaveral, Fla. Endeavour will make a stop in Houston before heading to the California Science Center in Los Angeles.(AP Photo/Terry Renna)

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Joey Morrison adjusts his space helmet after watching the shuttle aircraft carrier with space shuttle Endeavour atop, land Wednesday, Sept. 19, 2012, at Ellington Field in Houston. Endeavour is making a final trek across the country to the California Science Center in Los Angeles, where it will be permanently displayed. (AP Photo/David J. Phillip