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Wildfowl
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very rare vagrant
rare vagrant
rare winter visitor
rare summer visitor
Scarce passage migrant
Scarce winter visitor
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Scarce Resident
common passage migrant
common winter visitor
common summer visitor
common resident
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common resident

Lesser Black-backed Gull

Gulls
Larus fuscus
common resident

Herring Gull

Gulls
Larus argentatus
Scarce Resident

Yellow-legged Gull

Gulls
Larus michahellis
Scarce Resident

Caspian Gull

Gulls
Larus cachinnans
rare winter visitor

Iceland Gull

Gulls
Larus glaucoides
rare winter visitor

Glaucous Gull

Gulls
Larus hyperboreus
Scarce winter visitor

Great Black-backed Gull

Gulls
Larus marinus
Scarce passage migrant

Little Tern

Terns
Sternula albifrons
very rare vagrant

Caspian Tern

Terns
Hydroprogne caspia
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April 17, 1992
Willen
1 present
April 13, 1996
Caldecotte
1 flew through
May 11, 2001
Willen
1 present
July 9, 2017
Linford
An adult on several dates between 9th July and 14th Aug.
very rare vagrant

Whiskered Tern

Terns
Chlidonias hybrida
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May 16, 1994
Willen
2 adults from 16th-21st May. The same birds were also thought to have been seen on Rockland Broad, Norfolk the day before they appeared at Willen (during E winds). On the day after they left two Whiskered Terns were seen at Cley, Norfolk, where they were seen to fly out to sea.
October 29, 2001
Willen
An immature bird present from 29th until 31st when it flew off, later being found in Bedfordshire. Unfortunately it was not positively identified until 31st.
Scarce passage migrant

Black Tern

Terns
Chlidonias niger
very rare vagrant

White-winged Black Tern

Terns
Chlidonias leucopterus
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August 31, 2008
Wilstone Res. Herts.
2 juveniles seen to fly into Bucks
May 19, 2019
Foxcote Res.
1 adult
May 20, 2019
Willen
1 adult
Scarce passage migrant

Sandwich Tern

Terns
Sterna sandvicensis
common summer visitor

Common Tern

Terns
Sterna hirundo
very rare vagrant

Roseate Tern

Terns
Sterna dougallii
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September 6, 1944
Marlow
1 present
June 4, 1982
Willen
2 present
May 8, 1983
Mount Farm, Bletchley
1 adult
May 7, 1994
Willen
1 adult
May 28, 2000
Little Marlow GP
A 1st summer bird for 30 mins
May 13, 2011
Jubilee River
1 present
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