Number of 1km squares in which each species
was recorded in London



These figures show the total number of squares in which a given species was recorded at least once in a particular year. They provide as useful indication of which species are widely distributed and which have more restricted distributions. For comparative purposes the data can be used to calculate the frequency of occurrence of each species by dividing the number of squares occupied by the total number of squares surveyed. This measure has the advantage that it can be used to compare results based on different numbers of squares. Particular care should be taken in interpreting such results where only a few squares could be surveyed (less than 30-50 squares). While these figures may provide a general indication of major changes in distributions over time they do not provide a statistically robust measure of such changes because they do not take account of the BBS sampling strategy or of temporal variation in the sample of squares surveyed.
BBS trend analyses are available here

 
 

Species 94 95 96 97 98 99 00 01 02 03 04 05 06 07
Total No squares surveyed 34 36 42 44 57 61 59 53 58 61 89 91 102 118
Mute Swan 2 3 6 4 5 9 7 5 8 8 17 11 15 13
Whooper Swan . 1 . . . . . . . . . . . .
Greylag Goose 1 . . . 2 2 . 1 1 . 3 4 4 5
Feral/hybrid Goose . . . . 1 1 . . . . 1 2 1 1
Canada Goose 5 8 12 15 17 19 19 18 23 20 33 30 35 36
Barnacle Goose . . . . 1 . . . . . . . 1 .
Egyptian Goose . . . . . . . . . . 2 2 3 3
Shelduck 1 . . 1 . . 1 . . 1 2 1 1 2
Mandarin . 1 . 1 2 2 2 1 4 4 3 . 3 4
Wigeon . . . . . . 1 . . . 1 . . .
Gadwall . . . . . . . 1 . 1 1 1 . .
Teal . . . . 2 . . . . 1 . . . .
Mallard 16 20 21 25 27 35 29 31 28 36 48 53 54 60
Feral/hybrid mallard type . . . . . . . . 1 1 3 2 2 3
Shoveler 1 . 1 . . . . . . . 1 . 2 .
Red-crested Pochard . . . . . . . . 1 2 . . . .
Pochard 1 . 1 . 2 1 1 2 1 2 4 4 2 3
Tufted Duck 3 3 6 4 10 7 6 7 9 7 11 14 19 9
Goosander . . 1 . . . . . . 2 . . . .
Ruddy Duck . . 1 . 1 . . 1 1 1 2 2 2 .
Red-legged Partridge 1 . 2 1 1 1 . . 2 1 2 3 2 2
Grey Partridge . . . . . . . . . . . 1 . .
Pheasant 3 4 2 6 6 5 6 4 8 7 6 6 8 18
Little Grebe 1 . . 1 1 . . . 1 . 1 4 3 .
Great Crested Grebe 1 3 2 4 2 2 1 2 4 4 7 4 7 5
Cormorant 2 5 6 10 13 16 15 16 14 21 35 36 36 43
Little Egret . . . . . . . . . . . . . 2
Grey Heron 12 10 15 13 18 19 20 20 23 23 31 26 41 35
Red Kite . . . . . 1 . . . . . . . .
Sparrowhawk 2 5 2 9 5 9 8 6 6 8 9 9 10 15
Kestrel 11 6 11 9 13 13 12 13 10 11 18 14 16 19
Hobby . . . . . 2 . . . 1 . . 1 1
Moorhen 10 10 13 8 19 17 19 18 23 22 36 32 36 40
Coot 8 8 11 9 11 12 12 14 14 15 27 23 26 24
Oystercatcher . . . . . . . . . . 1 1 . .
Little Ringed Plover . 1 . . . 1 1 . . . . . . .
Ringed Plover 1 . . . . . . 1 1 . . . 1 .
Lapwing 3 3 3 3 1 1 4 1 1 2 4 3 2 8
Dunlin . . . . . . . . . . . 1 . .
Snipe . . . . . . . . . . . . . 1
Whimbrel . . . 1 . . . . . . . . . .
Curlew . . . . . . . . 1 . . . . .
Redshank 1 . . . . . 1 1 1 . . . . .
Common Sandpiper . 1 1 . 2 1 . . . . . 1 . .
Black-headed Gull 5 8 6 6 10 10 10 12 7 11 14 16 21 26
Common Gull 1 . 4 . 3 5 4 3 3 6 6 6 9 14
Lesser Black-backed Gull 3 5 2 9 17 17 16 11 17 14 25 23 22 35
Herring Gull 1 3 4 9 17 9 8 14 16 19 26 25 24 24
Great Black-backed Gull . 1 . 1 1 . 2 1 1 1 2 2 1 1
Common Tern . 3 2 3 5 5 2 6 7 6 9 7 9 9
Feral Pigeon 27 31 37 41 50 53 50 48 50 54 76 80 89 102
Stock Dove 5 5 5 5 7 9 8 6 11 12 12 12 13 19
Woodpigeon 33 35 42 43 57 61 59 53 58 61 89 91 101 118
Collared Dove 19 23 27 29 31 37 34 35 37 37 54 57 67 77
Turtle Dove . . 1 . . . . . . . . . . 1
Ring-necked Parakeet . 2 1 1 3 2 8 5 9 16 39 33 45 62
Cuckoo 3 4 3 3 3 4 3 4 . 3 2 4 6 3
Little Owl . . . . . . . . 1 2 1 . . .
Tawny Owl . . . . . . 1 1 . . . . . 1
Swift 26 28 34 31 45 40 47 41 45 49 73 76 77 81
Kingfisher . 1 1 . 2 1 1 . . . 2 1 4 1
Green Woodpecker 9 12 15 12 17 21 25 23 29 24 35 35 40 41
Great Spotted Woodpecker 9 14 13 15 23 18 28 17 25 32 34 45 54 58
Lesser Spotted Woodpecker 1 . . 1 . . . . . . . 3 1 .
Skylark 7 5 6 7 9 8 7 6 8 10 10 13 13 15
Sand Martin . . . . . 1 1 . 1 1 2 2 2 4
Swallow 5 5 9 8 13 14 9 6 11 15 18 15 18 17
House Martin 12 13 18 11 14 10 14 9 11 14 21 22 28 19
Tree Pipit . . . . . . 1 1 . . . 1 1 .
Meadow Pipit 2 1 . . . 2 1 . 1 . 3 3 6 6
Yellow Wagtail 2 1 . . 1 . . . . . 1 . . .
Grey Wagtail 1 1 3 2 3 1 1 3 7 12 6 8 4 6
Pied Wagtail 2 7 9 9 15 12 21 17 14 27 27 33 30 29
Wren 28 29 35 37 51 55 54 51 55 59 84 86 93 109
Dunnock 20 23 36 33 40 42 40 38 39 50 64 60 76 86
Robin 29 32 38 38 47 56 54 52 57 59 87 87 99 115
Black Redstart . . . . 1 . . . . . . . 1 1
Wheatear . . . . . . 1 1 1 2 2 . 1 1
Ring Ouzel . . . . . . . . . . . . 1 .
Blackbird 34 36 42 43 57 60 59 53 58 61 89 91 102 118
Fieldfare . . . . 1 . 1 . . . . . . 1
Song Thrush 21 26 31 28 35 36 36 32 37 41 62 53 66 71
Redwing . . . . . . 2 . . . 1 1 . .
Mistle Thrush 17 19 23 15 29 26 25 31 21 22 42 45 42 41
Cettis Warbler . . . . . . . . . . . . 1 .
Grasshopper Warbler . . . . . . . 1 1 . . . . 1
Sedge Warbler 1 . 1 1 1 2 1 1 2 3 2 4 1 5
Reed Warbler 1 . . 1 2 . 2 1 1 2 2 3 4 5
Blackcap 12 13 15 18 22 26 28 23 36 34 52 51 52 57
Garden Warbler 2 4 3 5 3 5 3 4 5 5 5 6 5 6
Lesser Whitethroat 2 . 3 2 4 2 3 1 3 2 6 2 5 7
Whitethroat 6 6 10 13 18 15 12 13 16 15 34 25 27 28
Wood Warbler 1 . . . . . . . . . . . . .
Chiffchaff 10 9 15 21 23 20 20 18 24 30 45 36 31 48
Willow Warbler 8 10 10 12 13 16 8 6 5 5 8 12 12 14
Goldcrest 5 3 6 5 5 8 8 7 15 19 22 25 15 33
Spotted Flycatcher 1 . 2 1 3 2 1 . . . . . . .
Long-tailed Tit 10 11 11 9 16 19 22 16 20 28 32 31 39 38
Marsh Tit . . . . . . . . 2 1 . . 3 1
Willow Tit . 1 . . . . . . . . 1 . . .
Coal Tit 6 3 5 6 7 6 9 10 10 11 14 11 19 18
Blue Tit 30 34 40 41 54 60 58 52 58 61 89 90 101 115
Great Tit 22 28 32 32 47 53 55 52 50 58 84 88 97 109
Nuthatch 6 3 7 4 5 5 7 6 7 12 12 13 18 18
Treecreeper 3 2 1 1 3 1 1 1 . 1 3 3 4 3
Jay 20 16 19 21 25 26 25 30 33 28 43 50 49 61
Magpie 31 34 39 43 56 58 56 52 56 60 87 89 100 116
Jackdaw . 4 2 4 10 6 11 8 10 14 13 18 21 22
Rook . 3 2 . 5 2 . 2 2 2 1 4 1 2
Carrion Crow 34 35 41 44 57 61 58 52 56 60 89 90 102 118
Starling 33 35 42 44 57 61 58 52 57 60 89 88 100 115
House Sparrow 32 33 41 42 55 57 53 48 54 56 75 77 83 94
Tree Sparrow . 1 . . . . . . . . . . 2 1
Chaffinch 12 13 14 14 22 28 36 29 34 38 59 62 80 90
Brambling . . . . . . . . . 1 . . . .
Greenfinch 23 20 29 28 35 34 37 36 38 47 76 78 82 98
Goldfinch 19 9 12 19 18 20 20 15 21 33 38 45 49 65
Siskin . . . . . . . . . . . . . 1
Linnet 7 6 7 7 9 10 7 6 8 8 15 10 7 9
Lesser Redpoll 1 1 . 1 1 . 1 . 1 . 1 . 1 .
Bullfinch 3 3 4 4 . 4 5 1 4 8 4 5 4 4
Yellowhammer 2 2 3 4 4 4 3 2 5 5 4 4 4 8
Reed Bunting 2 1 1 2 2 . 1 3 2 1 2 5 4 2
Corn Bunting 1 . . . . 1 . . . . . . . .
Bar-headed Goose . 1 . . . . . . . . . . . .
Hawaian Goose . . . . 1 1 . . . . . . . .
Peafowl . . . . . . . . . . 1 . 2 .
Budgerigar . . . . . . . . . . . 1 . .
Total number of Species 78 75 75 74 84 80 83 79 84 84 92 89 95 91

 


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