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Outdoors Maryland

Tomorrow, 5:30 a.m. MPT "Swiftly Falls the Night." Every autumn, thousands of chimney swifts come to roost in a huge old chimney in the Hampden section of Baltimore. This urban site is one of the top 10 for chimney swifts in the eastern United States. Why these birds have abandoned hollow tree trunks for human-built chimneys in a matter of a century or two remains a puzzle of the natural world.

"A Leg Up." In Howard County, a stable of horses offers the disabled improved health and happiness.

"Billfisher's Heaven." The white marlin is considered by anglers one of the top game fish in the world. Fishing for it brings millions of dollars in tourism revenue to Maryland alone. But researchers have warned that the white marlin may soon be listed as a threatened species. The DNR sets out on a daylong expedition to the Gulf Stream waters of the Baltimore Canyon 70 miles east of Ocean City to see just how prevalent white marlins are.

The Environmental Report

Tuesday, 9:55 a.m. WEAA (88.9 FM)

Host Morning Sunday provides reports on air quality and tips to help regreen cities.

Outdoors Maryland

Tuesday, 7:30 p.m. (Repeats Aug. 20, 5:30 a.m. and 5:30 p.m.) MPT

"Spawning Hopes." At the turn of the 20th century, oyster harvests from the Chesapeake Bay numbering in the millions of bushels were commonplace. Last year, harvests approached just 23,000 bushels. Oysters are responsible for filtering the Chesapeake's water. This segment explores the latest efforts of scientists and policymakers as they attempt to determine whether to release the Asian oyster, keep the native Chesapeake oyster in place or wait until more studies are completed.

"Piercing the Forest." Department of Natural Resources wildlife biologist Dave Brinker goes to the steep and rocky slopes of the Western Maryland mountains to track down what he believes to be the only nesting pair of goshawks in the state, fit the birds with expensive tracking transmitters, and return them to the safety of their treetop nests.

Sky Watch

Thursday, 8:33 a.m., WYPR (88.1 FM)

Hosts are Jim O'Leary, senior director of technology, IMAX and Davis Planetarium at the Maryland Science Center, and Carol Christian, deputy head of the Community Missions Office of the Space Telescope Science Institute.

Online blog

Read Sun science writer Frank Roylance's weather and astronomy blog, updated daily at

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