History
The Reserve from a wooded patch in Rosemoor's gardensRosemoor's present day grounds cover some 35 acres. Of these, some 25 acres have been dedicated as a Nature Reserve. Through the valley in which the Reserve lies and over which Rosemoor looks out, a small stream flows to the sea, discharging itself through Sandyhaven Pill into the Milford Haven estuary. With the help of a grant from the Nature Conservancy Council this stream was dammed, creating a 5½-acre lake which now forms the heart of the Reserve.
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Geography
Plan of the Rosemoor Nature ReserveThe hillside on a still morning in early Spring The Reserve lies just to the South-East of a steep wooded slope across the valley, composed of Silurian shales, which now forms the Western edge of the Lake. At that point the Eastern bank of the stream was sloping very gradually, so that now the Lake is very shallow over a considerable distance on that side. On the Western side it is quite deep. This combination makes the Lake an ideal place for a great variety of wildlife.

Upon flooding former hillocks in the valley were completely surrounded by water, forming refuge islands for birds to breed. The vegetation of the valley was drowned when it was flooded; the remains of trees can still be seen standing in the Lake in one of the photographs on this page.

In the Reserve paths have been created which form part of the National Park network, linking inland areas to the coast. In various places tiny streams flow into the Lake from the Eastern side, causing stretches of the path bordering the Lake on that side to be rather wet in all but the driest weather. Students of Pembrokeshire College - who come late every Winter or early Spring as part of their outdoor training - have started erecting boardwalks in the wettest parts. Longer stretches are to be done in the years to come.
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Fauna
The hillside in the Nature Reserve under a threatening sky The Rosemoor Nature Reserve is inhabited by badgers (at least 2 setts are situated within the grounds), otters (difficult to see, except for their spraint which is a telltale sign of their presence) and a great variety of birds. Mallard, coot and moorhen are to be found, as are the Canada Geese, who return every year to produce their delightful fluffy yellow goslings on the islands in the Lake. Heron, Cormorant, lesser black backed gulls are regular visitors, as are little grebe, pochard, golden-eye and tufted ducks. The lovely blue of a kingfisher is frequently seen as well.
Somewhat older goslings with their mother Since early 2007 a pair of mute swans are in residence on the lake and have successfully raised cygnets.
Peregrine Falcons breed within sight of Rosemoor, and if you are lucky Merlins can be seen hunting for prey.
In the Reserve, in the fields surrounding us and close to our house as well we very frequently see pheasants (possibly escaped from a nearby farm, but happy enough to live in the wild, or so it seems), rabbits and the more common types of birds: magpies, jackdaws, robins, tits, house martins, etcetera.
More common birds of prey - notably owls and buzzards - live off the small animals literally walking onto their dinner plates; perched on a nearby telephone pole, all they have to do is wait.
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Flora
Some of the refuge islands in the lake from the path on the hillThe Reserve is a botanist's delight: Tommy Warren-Davies, one of the foremost Welsh naturalists, and John Comont were the first wardens of the Reserve and in it they catalogued nearly 200 different species of flora, including a handful of rare plants.
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The Meadow
The Lake in the Nature ReservePart of the Reserve is kept as a meadow. In the spring of 2007 this part of the Reserve was fenced and new gates were put in. This allows us to have a pair of Welsh ponies for part of the year (in an arrangement with the Pembrokeshire Coast National Park); to our benefit and that of nature, as the open meadowland is attractive to various butterflies and small songbirds. Grazing keeps the blackthorn from taking over. In other parts of the reserve the blackthorn has to be removed periodically by man.
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And some more photos of the Reserve ...
Looking out over the lake just after sunrise in early summer One of the mute swans gently floating Mist rising from from the lake one early morning 
View of the Reserve on a grey evening 
Ponies in the meadow
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