Number of 1km squares in which each species
was recorded in East of England



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 216 251 255 298 290 300 251 107 252 236 258 313 365 433
Mute Swan 30 26 35 35 38 45 27 14 27 34 36 41 49 50
Whooper Swan . . . . . 1 . . . . . . . .
Pink-footed Goose . . . . . . . . . . . . . 1
White-fronted Goose . . 1 . . . . . . . . . . .
Greylag Goose 11 15 22 16 25 27 22 4 22 36 34 40 52 58
Feral/hybrid Goose . . . . . . . . 2 . 5 4 6 5
Snow Goose . . 1 . . . . . . . . . . .
Canada Goose 38 32 45 47 46 49 40 13 45 34 46 58 83 76
Barnacle Goose 2 2 2 2 2 2 . . . . 1 . 1 4
Brent Goose 1 1 1 1 . 1 . . 1 1 2 2 2 2
Black Brant . . . . . . . . . . . . 1 .
Egyptian Goose 2 2 . 4 7 5 7 . 6 8 11 10 9 16
Ruddy Shelduck . . . . . . . . . . . . . 2
Shelduck 22 28 29 36 43 41 38 12 29 27 35 34 41 47
Mandarin . 1 1 4 . 1 2 . 1 2 . 1 4 2
Wigeon . . 1 2 . . 1 . . 1 1 . . 1
Gadwall 7 4 6 9 9 7 7 6 6 6 9 7 10 19
Teal 1 2 2 . . 2 1 . 4 2 3 2 5 5
Mallard 122 136 144 153 162 177 144 45 151 134 165 189 229 260
Feral/hybrid mallard type . . . . . . 2 1 3 4 3 5 6 12
Pintail . . . . . . . . . . . . . 1
Garganey . . . . . 2 2 . . . . . . .
Shoveler 3 2 5 2 3 3 6 1 3 2 4 3 7 5
Red-crested Pochard . . . 1 . . . . . . 1 . 1 .
Pochard 2 3 2 2 2 . 4 1 . 2 4 4 3 5
Tufted Duck 26 19 24 24 29 30 24 11 21 19 24 27 30 35
Scaup . . . . . . 1 . . . . . . .
Common Scoter . 1 . . . . . . . . . . . 1
Goldeneye . 1 . . . . . . . . . . . .
Goosander . . 1 1 2 . . 1 1 1 . . 1 .
Ruddy Duck 1 1 3 1 1 2 3 1 2 2 1 2 1 4
Red-legged Partridge 124 148 157 172 171 170 138 50 141 132 156 175 205 235
Grey Partridge 38 47 51 55 50 41 41 7 30 24 31 51 48 54
Quail 2 7 1 8 4 4 3 1 4 . 1 4 2 2
Pheasant 173 203 216 249 236 255 223 83 213 201 229 268 324 378
Golden Pheasant 1 4 1 . . . . . . . 1 2 2 .
Little Grebe 5 7 10 10 9 6 8 3 11 5 8 12 17 10
Great Crested Grebe 13 17 15 12 18 16 11 5 11 9 14 13 17 22
Black-necked Grebe . . . 1 . 1 1 1 1 1 1 1 1 1
Fulmar . . . 1 . . . . . . . . . .
Gannet . . . . . . . . . . . 1 . .
Cormorant 19 31 29 35 33 49 42 12 42 37 36 50 64 66
Shag . . . . 1 1 . . . . . . . .
Bittern . . . . . . . . . . 3 . 2 .
Little Egret . . . . . . . . . 3 5 8 5 12
Grey Heron 53 58 54 70 56 93 52 25 70 70 59 97 118 124
Honey Buzzard . . . . 1 . . . . . . . . .
Red Kite . 1 . . . . . . . . . 5 7 7
Marsh Harrier 3 4 5 4 9 12 6 . 10 9 9 11 14 19
Hen Harrier . . . 1 . . . . . . 1 . . .
Montagus Harrier . . 1 1 . . . . . . 1 . . 2
Goshawk . . . . . 1 . . . . . 1 . 1
Sparrowhawk 41 40 28 29 42 54 39 12 30 34 37 54 67 61
Buzzard 1 2 1 3 5 8 7 4 8 15 21 24 46 63
Osprey . 2 1 1 . . . . . . . 2 . .
Kestrel 86 99 85 100 84 110 95 27 66 89 60 112 133 157
Merlin . . . . . . . . 1 . . . . .
Hobby 7 5 8 6 5 5 5 5 9 5 6 9 12 21
Peregrine . . . . 1 2 2 . . . . . . 2
Water Rail 1 1 1 . . . . . . 1 . 1 . 1
Moorhen 82 110 101 97 100 131 102 43 102 100 100 131 151 185
Coot 24 30 26 28 38 38 33 7 30 29 39 45 47 65
Crane . . . . . . . . . . 1 1 1 1
Oystercatcher 13 15 19 23 22 22 22 7 27 26 27 27 32 49
Avocet . . . 1 1 1 2 . . 1 2 . 4 4
Stone-curlew 3 1 3 3 5 4 4 . 2 1 1 1 . .
Little Ringed Plover 5 . 1 3 2 1 2 . . 1 . . . 1
Ringed Plover 3 2 2 4 1 2 2 2 1 1 2 . 3 1
Golden Plover 2 . . 2 . 2 . . . 1 1 2 1 2
Grey Plover . 1 1 . . 1 2 . . . . 1 3 1
Lapwing 49 66 71 66 64 70 50 23 59 60 74 85 95 101
Dunlin . . 2 2 . . 1 . . 2 . . 2 2
Ruff . . . . . . 1 . 1 . . 1 . .
Jack Snipe . . . . 1 . . . . . . . . .
Snipe 9 4 6 3 3 5 2 1 1 4 2 5 5 3
Woodcock 1 . 1 . 1 1 . . . . 2 . . 1
Black-tailed Godwit . 3 . 1 2 3 3 . 2 1 3 4 7 3
Bar-tailed Godwit . . . . . . . . . . 1 1 1 3
Whimbrel 3 2 3 4 2 7 3 . 7 4 6 3 4 3
Curlew 8 11 16 19 17 18 15 . 13 3 15 9 12 17
Spotted Redshank . 1 . . . 1 . . . . . . . 1
Redshank 9 9 10 7 8 10 12 6 12 7 11 8 11 15
Greenshank 2 . 2 2 . . 4 . 1 . 5 1 . 3
Green Sandpiper . 1 1 1 1 . . . 1 1 . . 1 1
Wood Sandpiper . . . . . . . . . 1 . . . 1
Common Sandpiper 2 . 1 3 1 1 1 . 1 1 5 3 2 2
Turnstone 2 . 2 1 . 2 . . 2 . 1 1 3 1
Mediterranean Gull . . . . . . . 1 . . . . 1 .
Little Gull 1 1 . . . . . . . . . 1 . .
Black-headed Gull 51 59 67 90 69 65 59 22 55 59 61 67 91 105
Common Gull 9 11 18 13 16 14 9 3 12 15 12 14 14 22
Lesser Black-backed Gull 42 47 58 79 77 62 60 28 62 56 80 70 87 103
Herring Gull 26 26 40 48 51 46 39 11 35 38 44 52 65 77
Yellow-legged Gull . . . . . . . . 1 . . . . .
Great Black-backed Gull 7 5 5 9 13 5 5 1 5 5 4 5 11 14
Sandwich Tern 1 . . 1 . . . . 2 . . . . .
Common Tern 13 12 10 16 18 27 16 3 17 13 19 27 31 29
Little Tern 1 . 2 1 1 3 . . . . . 2 2 1
Black Tern . 1 . . 1 . . . . . . . . 1
Rock Dove . . . . . . . . . . . . 1 .
Feral Pigeon 48 59 61 77 82 84 59 28 63 54 68 77 87 93
Stock Dove 86 112 100 122 115 143 109 47 110 108 120 140 156 165
Woodpigeon 215 251 255 297 290 299 250 105 250 233 257 312 361 430
Collared Dove 124 153 158 185 184 200 176 74 179 156 175 228 246 291
Turtle Dove 68 88 89 101 110 110 88 40 71 72 74 78 65 59
Ring-necked Parakeet . . 1 . . . . . . . . 1 . 1
Cuckoo 124 134 141 144 149 139 119 25 81 65 94 107 128 123
Barn Owl 2 5 3 5 5 8 8 4 5 13 12 15 19 29
Little Owl 10 12 12 18 10 16 16 11 12 17 10 8 20 21
Tawny Owl 5 9 12 6 10 16 11 9 6 9 10 6 12 18
Long-eared Owl 1 1 . 1 . . . . . . . . . .
Short-eared Owl . . 1 1 . 2 1 . . 1 . 2 . 1
Nightjar . . . . . . . . . . . . . 1
Swift 121 125 127 141 145 149 122 57 125 121 132 171 197 176
Kingfisher 5 7 6 6 6 6 6 1 13 6 8 5 15 14
Green Woodpecker 61 69 88 112 136 139 134 53 130 119 132 180 221 245
Great Spotted Woodpecker 66 83 97 111 110 125 100 45 113 94 125 143 191 213
Lesser Spotted Woodpecker 6 3 7 1 4 7 4 1 3 5 2 3 4 2
Woodlark 2 3 2 2 5 10 10 2 5 5 6 5 7 6
Skylark 192 216 222 258 256 261 220 88 214 203 218 268 307 361
Sand Martin 9 13 14 14 13 18 11 3 10 8 14 16 18 16
Swallow 163 164 182 195 191 208 168 74 166 151 183 232 265 300
House Martin 79 88 98 97 82 95 79 37 77 81 105 113 134 136
Tree Pipit 4 6 3 7 2 7 5 1 3 3 5 5 6 7
Meadow Pipit 31 34 31 35 40 44 31 11 25 30 43 55 60 52
Rock Pipit . . . . 1 . 1 . . . . . . 1
Water Pipit . . . . . 1 . . . . . . . .
Yellow Wagtail 35 57 53 53 54 57 47 16 38 34 41 50 43 36
Grey Wagtail 2 6 2 6 7 10 6 2 14 7 3 18 20 17
Pied Wagtail 86 110 116 125 130 153 126 50 134 129 130 173 180 213
Dipper . . . . . . 1 . . . . . . .
Wren 197 232 230 258 261 277 234 97 233 216 241 293 333 400
Dunnock 170 206 205 231 224 250 206 84 211 192 202 267 298 356
Robin 181 225 221 262 256 267 232 94 235 216 235 290 337 401
Nightingale 13 7 6 10 10 14 8 2 11 11 9 8 15 11
Black Redstart . . . . 1 . . . . . 1 . . .
Redstart 2 3 5 4 3 4 2 . 2 1 2 1 3 3
Whinchat 2 2 2 3 . 1 2 . 2 3 . 1 1 3
Stonechat 2 . . 1 . 3 1 . . 3 1 1 1 3
Wheatear 9 12 12 11 17 8 8 1 7 5 6 12 13 15
Ring Ouzel . 1 . 1 1 1 . . 1 1 2 1 1 1
Blackbird 210 247 249 286 279 294 245 104 247 230 249 306 356 417
Fieldfare 3 4 4 4 3 1 2 1 1 12 2 2 6 4
Song Thrush 162 182 186 178 191 197 176 78 186 175 182 226 271 315
Redwing . . 2 . 1 . 2 . . 5 . 3 5 2
Mistle Thrush 102 131 138 155 152 163 128 44 117 115 117 139 151 171
Cettis Warbler . . . . . 1 1 1 1 1 3 4 1 6
Grasshopper Warbler 8 5 3 4 5 5 4 1 1 1 4 4 4 6
Sedge Warbler 35 43 46 41 43 51 34 24 40 34 45 40 55 54
Marsh Warbler . . . . . . 1 . . . . . . .
Reed Warbler 30 34 35 37 38 41 34 17 34 30 44 45 48 48
Blackcap 141 169 164 180 203 218 190 78 172 155 194 223 270 302
Garden Warbler 38 63 54 66 56 72 60 15 39 40 51 59 65 60
Lesser Whitethroat 50 64 77 42 61 65 58 22 43 46 56 79 90 90
Whitethroat 150 175 199 214 228 220 200 78 196 178 198 239 284 307
Wood Warbler 3 2 2 . 1 . 1 . . . . . . 1
Chiffchaff 104 119 115 141 171 137 141 45 137 151 175 193 203 266
Willow Warbler 131 160 150 152 146 151 124 39 96 75 86 96 109 136
Goldcrest 32 52 44 51 48 62 57 14 55 68 72 79 85 95
Firecrest . . . . . . 2 . . . . . 1 .
Spotted Flycatcher 28 27 40 29 28 21 30 12 16 12 28 20 24 22
Pied Flycatcher . . . . . 1 1 . . . . . . 1
Bearded Tit . . . . . . . . . 1 1 1 1 1
Long-tailed Tit 86 106 82 94 100 125 130 35 93 111 122 147 161 196
Marsh Tit 11 19 17 25 16 24 18 4 11 17 14 17 17 20
Willow Tit 8 8 9 3 4 3 3 1 1 1 2 1 1 3
Coal Tit 41 47 43 53 45 58 46 16 47 42 44 59 68 68
Blue Tit 193 224 224 278 265 279 232 92 234 216 239 292 338 402
Great Tit 179 217 212 244 252 261 221 84 218 198 219 280 324 381
Nuthatch 19 18 25 24 21 31 15 10 19 16 25 21 27 33
Treecreeper 21 23 38 30 21 32 26 7 16 19 23 20 40 35
Golden Oriole . . 1 . . 1 . . . . . . 1 .
Jay 67 75 62 86 77 93 84 29 86 81 83 102 144 142
Magpie 146 184 183 208 207 220 180 86 188 185 182 237 273 321
Jackdaw 103 143 146 187 175 183 165 61 158 151 176 216 243 269
Rook 115 139 147 170 167 157 141 48 154 136 146 169 214 243
Carrion Crow 195 207 222 262 252 263 223 96 226 219 232 296 339 403
Hooded Crow . . . . . . . . . . . 1 . .
Raven . . . . . . . . . . . 1 . .
Starling 183 222 217 238 236 242 198 90 196 178 182 243 267 305
House Sparrow 164 182 185 211 200 211 166 67 159 157 164 202 223 248
Tree Sparrow 10 18 12 9 10 9 7 1 7 2 5 5 3 4
Chaffinch 199 240 238 281 276 290 242 102 244 230 250 307 357 421
Brambling . 1 1 1 2 . 1 1 . 1 . . 1 .
Greenfinch 158 189 189 229 209 228 202 82 206 204 220 269 313 357
Goldfinch 133 147 144 164 149 171 151 58 135 126 153 187 219 262
Siskin 2 8 3 3 2 4 1 3 6 3 4 4 10 5
Linnet 132 157 161 179 174 181 145 50 150 138 143 152 164 163
Twite . . . . . . . . . . . . 1 .
Lesser Redpoll 4 4 6 4 3 2 3 . 3 2 4 . 7 1
Crossbill 1 4 . 3 5 2 1 . 2 3 2 2 3 1
Bullfinch 49 52 61 56 58 62 46 25 44 63 48 60 63 70
Hawfinch . . 1 1 . . . . . . . . . 1
Yellowhammer 156 186 188 218 205 217 186 70 174 158 169 203 240 276
Reed Bunting 49 68 66 64 62 74 45 19 54 55 62 87 101 113
Corn Bunting 52 49 41 45 40 45 35 12 31 27 30 30 35 38
Black Swan . . . 1 1 1 2 1 1 . . . . .
Bar-headed Goose . . . . . 1 1 . . . . . . .
Muscovy Duck . . . . . 1 1 . . . 1 . . .
Carolina Wood Duck . . . . . . . . . . . . . 1
Peafowl 1 . . 5 7 4 5 2 3 4 5 8 11 10
Helmeted Guineafowl . . . . . . . . . . 3 6 3 4
Total number of Species 131 133 139 143 134 143 144 112 132 137 142 146 150 162

 


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