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Bird Migration Statistics
Birds are capable of travelling considerable distances. Many of the birds
seen at Moor Green Lakes spend either just the winter, or summer with us.
Others pass through in the spring and autumn as they migrate between their
summer breeding locations in the north, and wintering locations south of us.
The sight of arrivals and departures marks the passage of the seasons and
adds to the fascination of a visit to the Reserve.
The following information summarise the annual arrival and departure dates
recorded in the
MGLG Annual Reports produced since 1993.
This information is supplemented with informal data (in italics) from the
Monthly Bird Summaries where Annual Reports are not yet available. Information on the
locations where birds spend the rest of their time is abstracted from "The
Migration Atlas" produced by the British Trust for Ornithology. This
collates the results of 100 years of information on birds which have been
ringed and subsequently recovered. To provide meaningful statistical
information, only birds that are relatively common at Moor Green are
considered here. |
|

Green Sandpiper
(4th August
© Les Thorn)
Green Sandpipers breed in the boreal forest zone of north
Scandinavia and Russia; nesting in old song-bird nests and squirrel dreys.
They Winter in southern Britain, SW Europe and north Africa. Females
often leave before the young are fledged, followed later by the
juveniles and males. Small numbers spend the winter at Moor Green Lakes
and larger numbers pass through; August sightings are usually the most
numerous. Unlike many waders, they do not form flocks and individuals
may be found scattered around the lake margins and scrapes. |
|
Year |
Max |
Leave |
Return |
Max |
|
1993 |
1 |
09-May |
17-Jul |
6 |
|
1994 |
2 |
06-May |
16-Jul |
2 |
|
1995 |
2 |
May |
Jul |
3 |
|
1996 |
1 |
21-Apr |
18-Jun |
3 |
|
1997 |
1 |
24-Apr |
17-Jun |
6 |
|
1998 |
1 |
26-Apr |
18-Jul |
8 |
|
1999 |
2 |
17-Apr |
10-Jul |
4 |
|
2000 |
3 |
27-Apr |
13-Jul |
4 |
|
2001 |
3 |
26-Apr |
28-Jun |
8 |
|
2002 |
5 |
26-Apr |
26-Jun |
3 |
|
2003 |
3 |
26-Apr |
17-Jun |
5 |
|
2004 |
2 |
19-Apr |
20-Jun |
6 |
|
2005 |
2 |
13-Apr |
11-Jun |
4 |
|
2006 |
2 |
21-Apr |
09-Jun |
15 |
|
2007 |
1 |
04-May |
16-Jun |
8 |
|
2008 |
3 |
24-Apr |
17-Jun |
13 |
|
2009 |
4 |
21-Apr |
24-Jun |
11 |
|
2010 |
7 |
19-Apr |
26-Jun |
7 |
|
|
|
|
|
|
|
Earliest/Min |
1 |
13-Apr |
09-Jun |
2 |
|
Average |
2.5 |
24-Apr |
26-Jun |
6.3 |
|
Latest/Max |
7 |
09-May |
18-Jul |
15 |
|
|
|
Year |
Arrive |
Max |
Leave |
|
1993 |
20-Mar |
9 |
29-Jul |
|
1994 |
28 Mar |
11 |
29-Aug |
|
1995 |
26-Mar |
7 |
27-Aug |
|
1996 |
16 Mar |
12 |
11-Aug |
|
1997 |
08-Mar |
12 |
02-Sep |
|
1998 |
28-Mar |
7 |
10-Sep |
|
1999 |
13-Mar |
8 |
16-Aug |
|
2000 |
23-Mar |
5 |
28-Aug |
|
2001 |
- |
5 |
30-Jul |
|
2002 |
16-Mar |
11 |
08-Jul |
|
2003 |
03-Mar |
9 |
01-Aug |
|
2004 |
23- Mar |
11 |
18-Aug |
|
2005 |
24-Mar |
10 |
16-Aug |
|
2006 |
16-Mar |
13 |
15-Aug |
|
2007 |
16-Mar |
11 |
05-Aug |
|
2008 |
17-Mar |
15 |
09-Aug |
|
2009 |
13-Mar |
19 |
31-Jul |
|
2010 |
18-Mar |
12 |
28-Aug |
|
|
|
|
|
|
Earliest/Min |
03-Mar |
5 |
08-Jul |
|
Average |
18-Mar |
10.5 |
13-Aug |
|
Latest/Max |
28-Mar |
19 |
10-Sep |
|

Little Ringed Plover (4th May 2009 -
© Gary Randall)
This smart little plover first started to
breed in Britain in 1938, and has yet to colonise Ireland. They spend
the winter south of the Sahara. A few pairs have been breeding at Moor
Green Lakes since 1990, preferring the exposed gravel which results from
the extraction process. |
|
|

Common Sandpiper (23 April 2009 - © David Lowther)
This small wader passes through Moor Green
Lakes on its northerly migration from sub-Saharan west Africa and
southern Europe where it spends the winter. It breeds in northern Britain and Scandinavia. Occasionally Common Sandpipers spend the
winter in Berkshire and have also bred in the county. |
|
Year |
Arrive |
Max |
Leave |
Return |
Max |
Leave |
| 1993 |
10-Apr |
5 |
19-May |
02-Jul |
4 |
14-Sep |
| 1994 |
19-Apr |
5 |
22 May |
29-Jun |
6 |
08-Oct |
| 1995 |
02-Apr |
4 |
18-May |
01-Jul |
5 |
30-Sep |
| 1996 |
11-Apr |
3 |
22-May |
25-Jun |
4 |
05-Oct |
| 1997 |
14-Apr |
6 |
02-Jun |
16-Jul |
4 |
17-Sep |
| 1998 |
01-Apr |
4 |
29-May |
11-Jul |
4 |
20-Sep |
| 1999 |
11-Apr |
2 |
19-May |
04-Jul |
3 |
28-Sep |
| 2000 |
18-Apr |
2 |
25-May |
15-Jul |
6 |
17-Oct |
| 2001 |
16-Apr |
3 |
28-May |
30-Jun |
6 |
08-Oct |
| 2002 |
02-Apr |
4 |
18-May |
29-Jul |
2 |
08-Sep |
| 2003 |
19-Apr |
9 |
21-May |
05-Jul |
? |
19-Sep |
| 2004 |
16-Apr |
3 |
25-May |
19-Jul |
3 |
29-Sep |
| 2005 |
13-Apr |
2 |
22-May |
15-Jul |
2 |
08-Oct |
| 2006 |
09-Apr |
2 |
24-May |
08-Jul |
2 |
15-Oct |
| 2007 |
17-Apr |
3 |
21-May |
04-Jul |
5 |
08-Sep |
| 2008 |
12-Apr |
3 |
26-May |
21-Jun |
7 |
23-Sep |
| 2009 |
11-Apr |
5 |
15-May |
18-Jun |
5 |
09-Sep |
|
2010 |
05-Apr |
3 |
24-May |
14-Jul |
6 |
20-Sep |
|
|
|
|
|
|
|
|
Earliest/Min |
01-Apr |
2 |
05-May |
18-Jun |
2 |
08-Sep |
| Average |
11-Apr |
3.8 |
22-May |
06-Jul |
4.4 |
25-Sep |
|
Latest/Max |
19-Apr |
9 |
02-Jun |
29-Jul |
7 |
17-Oct |
|
|
|
Common Tern
Common Terns have been breeding at Moor
Green Lakes since 1991, not always successfully.
British breeding Common Terns winter on
the west coast of Africa. Occasionally, birds from further north pass
through on migration; these are separately noted where possible.
|
|
Year |
Arrive |
Fledged |
Leave |
Passage |
|
1993 |
12-Apr |
10 |
23-Jul |
|
|
1994 |
22-Apr |
13 |
21-Sep |
22-Oct |
|
1995 |
13-Apr |
2 |
15-Aug |
|
|
1996 |
13-Apr |
4 |
28-Aug |
|
|
1997 |
13-Apr |
0 |
18-Aug |
|
|
1998 |
20-Apr |
1 |
09-Aug |
10-Sep |
|
1999 |
19-Apr |
2 |
09-Sep |
|
|
2000 |
19-Apr |
14 |
15-Aug |
20-Sep |
|
2001 |
14-Apr |
18 |
12-Aug |
18-Sep |
|
2002 |
14-Apr |
16 |
27-Jul |
|
|
2003 |
26-Mar |
30 |
11-Aug |
|
|
2004 |
02-Apr |
23 |
21-Aug |
|
|
2005 |
24-Mar |
25 |
19-Aug |
|
|
2006 |
30-Mar |
0 |
08-Aug |
|
|
2007 |
11-Apr |
0 |
20-Aug |
|
|
2008 |
14-Apr |
3 |
29-Aug |
|
|
2009 |
10-Apr |
2 |
07-Sep |
|
|
2010 |
21-Apr |
2 |
28-Jul |
13-Sep |
|
|
|
|
|
|
Earliest/Min |
24-Mar |
0 |
23-Jul |
|
| Average |
11-Apr |
9.2 |
17-Aug |
|
|
Latest/Max |
22-Apr |
30 |
21-Sep |
|
| |
|
|
|
|
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Common Tern, 26 April 2009 - © Gary
Randall
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Redshank
mating, 16 April 2009 - © Jerry O'Brien

Small numbers of Redshank arrive at Moor
Green Lakes to breed, but they are never very successful. They nest on
the ground, usually in a tuft of Soft Rush (Juncus
sp.). The eggs or young are readily
predated by Crows and Foxes. The birds breeding at Moor Green Lakes
probably winter on the Channel coasts, and possibly as far as Spain.
Redshank on passage can drop in on Moor
Green Lakes and have been recorded in all months. Winter birds most likely to be Redshanks of the Icelandic breeding race which
winter around the British coasts in substantial numbers.
|
|
Year |
Arrive |
Max |
Leave |
Late
Passage |
|
1993 |
07-Mar |
8 |
26-Jun |
30-Dec |
|
1994 |
23-Feb |
8 |
23-Jul |
01-Dec |
|
1995 |
26-Feb |
6 |
23-Jul |
|
|
1996 |
28-Feb |
6 |
10-Jul |
07-Sep |
|
1997 |
08-Mar |
6 |
09-Aug |
|
|
1998 |
07-Mar |
6 |
24-Jul |
15-Aug |
|
1999 |
17-Mar |
4 |
26-Jun |
|
|
2000 |
11-Mar |
4 |
19-May |
|
|
2001 |
24-Mar |
4 |
23-Apr |
27-Sep |
|
2002 |
12-Mar |
4 |
07-Jul |
|
|
2003 |
12-Mar |
4 |
07-Jul |
17-Sep |
|
2004 |
13-Mar |
6 |
26-Jul |
05-Oct |
|
2005 |
20-Mar |
7 |
27-Jun |
01-Aug |
|
2006 |
21-Mar |
6 |
08-Jul |
21-Jul |
|
2007 |
12-Mar |
8 |
18-Jul |
01-Oct |
|
2008 |
07-Mar |
8 |
25-Jul |
25-Sep |
|
2009 |
20-Feb |
8 |
20-Jun |
28-Aug |
|
2010 |
01-Mar |
6 |
29-Jun |
07-Nov |
|
|
|
|
|
|
Earliest/Min |
20-Feb |
4 |
23-Apr |
|
| Average |
08-Mar |
6.1 |
04-Jul |
|
|
Latest/Max |
24-Mar |
8 |
09-Aug |
|
|
|
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Goosander
at roost, 29 January 2009 - © David Cary
Ever since the late 1980's, Grove Lake has been a Goosander winter
roosting site of regional importance. They feed mainly on fish, which
are abundant in the local lakes and rivers, and gather to socialise
before roosting.
Goosanders in the UK are at the west of their range which extends
throughout Scandinavia and northern Russia to the Bering Sea. "Our"
birds breed in northern England, Scotland and Scandinavia. The
males spend much of June to October in the fjords of northern Norway
where they undergo their moult. The females remain on the breeding
grounds with the young until they move south to the wintering sites such
as Moor Green Lakes and are reunited with the males.
*Exceptionally, in 1996 2 females remained until 18th May and one until
20 June.
|
| Winter |
Arrive |
Max |
Leave |
| 1993/94 |
20-Nov |
79 |
- |
| 1994/95 |
- |
49 |
- |
| 1995/96 |
- |
124 |
15-Apr* |
| 1996/97 |
15-Nov |
184 |
12-Apr |
| 1997/98 |
17-Nov |
87 |
28-Mar |
| 1998/99 |
17-Nov |
79 |
27-Mar |
| 1999/00 |
16-Nov |
72 |
07-Apr |
| 2000/01 |
16-Nov |
47 |
15-Apr |
| 2001/02 |
17-Nov |
55 |
24-Mar |
| 2002/03 |
07-Nov |
29 |
30-Mar |
| 2003/04 |
12-Nov |
31 |
29-Mar |
| 2004/05 |
13-Nov |
48 |
19-Mar |
| 2005/06 |
19-Nov |
37 |
09-Apr |
| 2006/07 |
07-Nov |
30 |
17-Apr |
| 2007/08 |
29-Oct |
46 |
04-Apr |
| 2008/09 |
01-Nov |
67 |
13-Apr |
| 2010/11 |
16-Oct |
118 |
21-Mar |
| |
|
|
|
|
Earliest/Min |
16-Oct |
29 |
19-Mar |
| Average |
10-Nov |
68.3 |
03-Apr |
|
Latest/Max |
20-Nov |
184 |
17-Apr |
| |
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