A female Osprey nicknamed 'Lady' (R) receives a fish from her male partner at the Loch of the Lowes nature reserve, near Dunkeld in Scotland June 4, 2013. The 28 year old Osprey has spent 23 breeding years at the reserve, and hatched what is thought to be her 50th chick at the weekend. REUTERS/Russell Cheyne (BRITAIN - Tags: ENVIRONMENT ANIMALS)

A female Osprey nicknamed 'Lady' (R) defends her nest from a female intruder at the Loch of the Lowes nature reserve, near Dunkeld in Scotland June 4, 2013. The 28 year old Osprey has spent 23 breeding years at the reserve, and hatched what is thought to be her 50th chick at the weekend. REUTERS/Russell Cheyne (BRITAIN - Tags: ENVIRONMENT ANIMALS)

An osprey returns to its nest with a fish in its talons on Little Hunting Creek off the Potomac River near Mt. Vernon, Virginia May 23, 2013. Picture taken May 23, 2013. REUTERS/Gary Cameron (UNITED STATES - Tags: ENVIRONMENT ANIMALS SOCIETY)

An osprey flies around its nest with a fish in its talons on Little Hunting Creek off the Potomac River near Mt. Vernon, Virginia May 23, 2013. Picture taken May 23, 2013. REUTERS/Gary Cameron (UNITED STATES - Tags: ENVIRONMENT ANIMALS SOCIETY)

An osprey with chicks sit on a nest in a marsh near the remote village of Rasolai, some 260 km (162 miles) northeast of Minsk, July 10, 2011. REUTERS/Vasily Fedosenko (BELARUS - Tags: ANIMALS ENVIRONMENT)

An osprey feeds its chick on a nest in a marsh near the remote village of Rasolai, some 260 km (162 miles) northeast of Minsk, July 10, 2011. REUTERS/Vasily Fedosenko (BELARUS - Tags: ANIMALS ENVIRONMENT IMAGES OF THE DAY)

An osprey sits on a tree branch in a marsh near the remote village of Rasolai, some 260 km (162 miles) northeast of Minsk, June 24, 2011. Photo taken June 24, 2011. REUTERS/Vasily Fedosenko (BELARUS - Tags: ANIMALS ENVIRONMENT)

A female Osprey carries a tree branch to her nest at Loch of the Lowes Wildlife Reserve, Perthshire, Scotland, March 29, 2011. She is believed to be the oldest breeding female ever recorded in the UK, having returned, following a 3,000 mile migration from West Africa, for the 21st year. REUTERS/Russell Cheyne (BRITAIN - Tags: ENVIRONMENT ANIMALS SOCIETY)

An adult Osprey flies with a fish in its talons in Cochrane, Alberta August 23, 2010. Cochrane is about 20 kilometers west of Calgary. REUTERS/Dan Riedlhuber (CANADA - Tags: ANIMALS)

An endangered Osprey chick is held by Ronnie Graham, a bird ringer from the Tweed Valley Osprey Project, after being weighed and tagged at a secret forest location in the Scottish Borders July 5, 2010. The Tweed Valley Osprey Project has successfully reared eighty five endangered Osprey chicks since 1998. REUTERS/David Moir (BRITAIN - Tags: ENVIRONMENT)

Tony Lightley, a conservation manager from the Tweed Valley Osprey Project, returns an Osprey chick to its nest at the top of a 100 foot (30 metre) tree after bringing down, tagging and weighing the bird of prey at a secret forest location in the Scottish Borders July 5, 2010. The Tweed Valley Osprey Project has successfully reared eighty five endangered Osprey chicks since 1998. REUTERS/David Moir (BRITAIN - Tags: ENVIRONMENT)

Tony Lightley, a conservation manager from the Tweed Valley Osprey Project, returns an Osprey chick to its nest at the top of a 100ft tree after bringing down, tagging and weighing the bird of prey at a secret forest location in the Scottish Borders July 5, 2010. The Tweed Valley Osprey Project has successfully reared eighty five endangered Osprey chicks since 1998. REUTERS/David Moir (BRITAIN - Tags: ENVIRONMENT)

A osprey with a broken bone is held before undergoing surgery at the Wildlife hospital in Ramat Gan near Tel Aviv June 16, 2010. The hospital treats about 2,00 animals each year, many of which are rescued after suffering injuries in the wild. The hospital, run by the Ramat Gan Safari and Israel's Nature and Parks Authority, also offers the animals treatments like physical therapy and hydrotherapy. REUTERS/Baz Ratner (ISRAEL - Tags: ANIMALS)

Veterinarian Dr. Ariella Rosenzweig prepares an osprey, with a broken bone, for surgery at the Wildlife hospital in Ramat Gan near Tel Aviv June 16, 2010. The hospital treats about 2,00 animals each year, many of which are rescued after suffering injuries in the wild. The hospital, run by the Ramat Gan Safari and Israel's Nature and Parks Authority, also offers the animals treatments like physical therapy and hydrotherapy. REUTERS/Baz Ratner (ISRAEL - Tags: ANIMALS)

A male Osprey returns to the nest with a fish to feed the female who had laid her first egg of the season this morning at the Loch of Lowes Wildlife reserve near Dunkeld, Scotland, April 13, 2010. REUTERS/Russell Cheyne (BRITAIN - Tags: ENVIRONMENT ANIMALS)

A female Osprey returns to its nest in Loch of Lowes, Dunkeld, Perthshire, Scotland March 24, 2010, following a 3,000 mile (4,828 km) migration from West Africa. The bird, thought to be the oldest breeding female of its kind ever recorded in the U.K, has returned for the 20th consecutive year to the Loch of Lowes Wildlife reserve, astonishing wildlife experts. This Osprey is estimated to be 25 years old, over three times the average lifespan of an Osprey. REUTERS/Russell Cheyne (BRITAIN - Tags: ENVIRONMENT ANIMALS SOCIETY)

A female Osprey returns to its nest in Loch of Lowes, Dunkeld, Perthshire, Scotland March 24, 2010, following a 3,000 mile (4,828 km) migration from West Africa. The bird, thought to be the oldest breeding female of its kind ever recorded in the U.K, has returned for the 20th consecutive year to the Loch of Lowes Wildlife reserve, astonishing wildlife experts. This Osprey is estimated to be 25 years old, over three times the average lifespan of an Osprey. REUTERS/Russell Cheyne (BRITAIN - Tags: ENVIRONMENT ANIMALS SOCIETY)

A female Osprey returns to its nest in Loch of Lowes, Dunkeld, Perthshire, Scotland March 24, 2010, following a 3,000 mile (4,828 km) migration from West Africa. The bird, thought to be the oldest breeding female of its kind ever recorded in the U.K, has returned for the 20th consecutive year to the Loch of Lowes Wildlife reserve, astonishing wildlife experts. This Osprey is estimated to be 25 years old, over three times the average lifespan of an Osprey. REUTERS/Russell Cheyne (BRITAIN - Tags: ENVIRONMENT ANIMALS SOCIETY)

A female Osprey returns to its nest in Loch of Lowes, Dunkeld, Perthshire, Scotland March 24, 2010, following a 3,000 mile (4,828 km) migration from West Africa. The bird, thought to be the oldest breeding female of its kind ever recorded in the U.K, has returned for the 20th consecutive year to the Loch of Lowes Wildlife reserve, astonishing wildlife experts. This Osprey is estimated to be 25 years old, over three times the average lifespan of an Osprey. REUTERS/Russell Cheyne (BRITAIN - Tags: ENVIRONMENT ANIMALS SOCIETY IMAGES OF THE DAY)

An Osprey (Pandion Haliaetus) carries a catfish at "Guama" in the Zapata Swamp Biosphere Reserve Park south of the Matanzas province in central Cuba March 5, 2010. The wetlands of Cuba represent about 4 percent of the island's territory and include habitats with unique and ideal vegetation for numerous animals such as manatis, crocodiles, fish and turtles, many resident and migratory birds. REUTERS/Desmond Boylan (CUBA - Tags: ANIMALS ENVIRONMENT SOCIETY)

Ospreys perch on branches in their breeding ground at Loch of Lowes in Perth, Scotland, March 31, 2008. The birds arrived in Perth on Monday from West Africa. REUTERS/Russell Cheyne (BRITAIN)

A male osprey flies to its breeding ground at Loch of Lowes in Perth, Scotland, March 31, 2008. Ospreys arrived in Perth on Monday from West Africa. REUTERS/Russell Cheyne (BRITAIN)