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The osprey and owls are the only raptors whose outer toe is reversible, allowing them to grasp their prey with two toes in front and two behind. This is particularly helpful when they grab slippery fish. [26] The osprey is 0.9–2.1 kg (2.0–4.6 lb) in weight and 50–66 cm (20–26 in) in length with a 127–180 cm (50–71 in) wingspan.
The egg shell is white or buff with bold splotches and spots of reddish-brown, sometimes so dark as to be black; purple or grey blotches may appear beneath the surface of the shell. [12] [16] The egg measurements are about 62 x 45 millimetres and weigh about 65 grams. [27] The eggs are incubated for about 35–43 days to hatching. [29]
A resident male osprey managed to attract a female osprey (a 2008 bird from a Rutland Water nest) who laid their first egg on 25 April 2011, a second three days later, and a final egg on 1 May 2011. On 5 June 2011 the first osprey chick emerged, the second on Monday 6 June 2011, and the third on 7 June 2011, comprising one female (ringed Blue ...
An osprey on nest at Loch of the Lowes, Scotland. The osprey (Pandion haliaetus) is a medium-large raptor which is a specialist fish-eater with a worldwide distribution. The subspecies Pandion haliaetus haliaetus is native to Eurasia and is found in the British Isles, where it is a scarce breeder primarily in Scotland, with smaller numbers in England and Wales.
The Glaslyn Osprey Project is located in the Glaslyn Valley at Pont Croesor near Porthmadog in Gwynedd, north-west Wales. The project has supported ospreys since 2004 when they came to the Snowdonia National Park to breed after being absent from Wales for decades. [ 1 ]
Dennis Puleston (30 December 1905 – 8 June 2001) was a British-American environmentalist, adventurer, and designer. He is known for playing a key part in securing a nationwide ban in the United States on the use of the pesticide DDT, a decision regarded as the first important success of the emerging environmental movement.
Later in his life, he was convicted on other charges and was issued a £2,800 fine. A year later, he was accused of attempting to cut down an osprey nesting tree with a chainsaw in Loch Garten, Scotland. Family and friends claimed he had retired from egg collecting during the early 1990s, and his last conviction was 10 years prior to his death. [3]
The earliest approaches to modern bird study involved the collection of eggs, a practice known as oology. While collecting became a pastime for many amateurs, the labels associated with these early egg collections made them unreliable for the serious study of bird breeding. To preserve eggs, a tiny hole was made and the contents extracted.