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 (fewer 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 08 09
Total No squares surveyed 216 251 255 298 290 300 251 107 252 237 258 314 368 437 362 364
Mute Swan 30 26 35 35 38 45 27 14 27 34 36 41 49 50 50 50
Black Swan . . . 1 1 1 2 1 1 . . . . . . .
Whooper Swan . . . . . 1 . . . . . . . . . .
Pink-footed Goose . . . . . . . . . . . . . 1 2 .
White-fronted Goose . . 1 . . . . . . . . . . . 1 .
Greylag Goose 11 15 22 16 25 27 22 4 22 36 34 40 52 58 50 53
Feral/hybrid Goose . . . . . . . . 2 . 5 4 6 5 6 4
Bar-headed Goose . . . . . 1 1 . . . . . . . . .
Snow Goose . . 1 . . . . . . . . . . . . .
Canada Goose 38 32 45 47 46 49 40 13 45 34 46 58 83 76 64 74
Barnacle Goose 2 2 2 2 2 2 . . . . 1 . 1 4 1 .
Brent Goose 1 1 1 1 . 1 . . 1 1 2 2 2 2 1 3
Black brant . . . . . . . . . . . . 1 . . .
Egyptian Goose 2 2 . 4 7 5 7 . 6 8 11 10 9 16 15 16
Ruddy Shelduck . . . . . . . . . . . . . 2 . .
Shelduck 22 28 29 36 43 41 38 12 29 27 35 34 41 47 27 33
Muscovy Duck . . . . . 1 1 . . . 1 . . . . .
Carolina Wood Duck . . . . . . . . . . . . . 1 . .
Mandarin . 1 1 4 . 1 2 . 1 2 . 1 4 2 2 2
Wigeon . . 1 2 . . 1 . . 1 1 . . 1 1 2
Gadwall 7 4 6 9 9 7 7 6 6 6 9 7 10 19 12 13
Teal 1 2 2 . . 2 1 . 4 2 3 2 5 5 4 7
Mallard 122 136 144 153 162 177 144 45 151 134 165 190 231 263 215 221
Feral/hybrid mallard type . . . . . . 2 1 3 4 3 5 6 12 12 15
Pintail . . . . . . . . . . . . . 1 . .
Garganey . . . . . 2 2 . . . . . . . 1 .
Shoveler 3 2 5 2 3 3 6 1 3 2 4 3 7 5 5 8
Red-crested Pochard . . . 1 . . . . . . 1 . 1 . . .
Pochard 2 3 2 2 2 . 4 1 . 2 4 4 3 5 3 6
Tufted Duck 26 19 24 24 29 30 24 11 21 19 24 27 30 35 25 36
Common Scoter . 1 . . . . . . . . . . . 1 . .
Goldeneye . 1 . . . . . . . . . . . . . .
Goosander . . 1 1 2 . . 1 1 1 . . 1 . . 1
Ruddy Duck 1 1 3 1 1 2 3 1 2 2 1 2 1 4 1 .
Helmeted Guineafowl . . . . . . . . . . 3 6 3 4 3 4
Red-legged Partridge 124 148 157 172 171 170 138 50 141 132 156 176 208 239 200 185
Grey Partridge 38 47 51 55 50 41 41 7 30 24 31 51 48 54 45 25
Quail 2 7 1 8 4 4 3 1 4 . 1 5 2 2 1 2
Pheasant 173 203 216 249 236 255 223 83 213 201 229 269 327 381 315 307
Golden Pheasant 1 4 1 . . . . . . . 1 2 2 . . .
Peafowl 1 . . 5 7 4 5 2 3 4 5 8 11 10 9 11
Little Grebe 5 7 10 10 9 6 8 3 11 5 8 12 17 10 11 10
Great Crested Grebe 13 17 15 12 18 16 11 5 11 9 14 13 17 22 16 20
Black-necked Grebe . . . . . 1 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 51 65 68 57 59
Shag . . . . 1 1 . . . . . . . . . .
Bittern . . . . . . . . . . 3 . 2 . 2 2
Little Egret . . . . . . . . . 3 5 8 5 12 14 14
Grey Heron 53 58 54 70 56 93 52 25 70 70 59 98 118 127 101 106
Honey Buzzard . . . . 1 . . . . . . . . . . .
Red Kite . 1 . . . . . . . . . 5 7 7 13 12
Marsh Harrier 3 4 5 4 9 12 6 . 10 9 9 11 14 19 17 14
Hen Harrier . . . 1 . . . . . . 1 . . . . .
Montagus Harrier . . 1 1 . . . . . . 1 . . 2 . .
Goshawk . . . . . 1 . . . . . 1 . 1 1 .
Sparrowhawk 41 40 28 29 42 54 39 12 30 34 37 54 68 62 53 61
Buzzard 1 2 1 3 5 8 7 4 8 15 21 24 46 64 59 96
Osprey . 2 1 1 . . . . . . . 2 . . . .
Kestrel 86 99 85 100 84 110 95 27 66 89 60 113 135 158 138 115
Merlin . . . . . . . . 1 . . . . . . 2
Hobby 7 5 8 6 5 5 5 5 9 5 6 9 12 21 9 15
Peregrine . . . . 1 2 2 . . . . . . 2 1 .
Water Rail 1 1 1 . . . . . . 1 . 1 . 1 1 1
Corncrake . . . . . . . . . . . . . . . 1
Moorhen 82 110 101 97 100 131 102 43 102 100 100 131 152 188 143 159
Coot 24 30 26 28 38 38 33 7 30 29 39 45 47 65 54 48
Crane . . . . . . . . . . 1 1 1 1 1 1
Oystercatcher 13 15 19 23 22 22 22 7 27 26 27 27 32 49 40 44
Avocet . . . 1 1 1 2 . . 1 2 . 4 4 5 5
Stone-curlew 3 1 3 3 5 4 4 . 2 1 1 1 . . . 2
Little Ringed Plover 5 . 1 3 2 1 2 . . 1 . . . 1 . 1
Ringed Plover 3 2 2 4 1 2 2 2 1 1 2 . 3 1 4 4
Golden Plover 2 . . 2 . 2 . . . 1 1 2 1 2 2 1
Grey Plover . 1 1 . . 1 2 . . . . 1 3 1 . .
Lapwing 49 66 71 66 64 70 50 23 59 60 74 85 95 102 90 92
Dunlin . . 2 2 . . 1 . . 2 . . 2 2 1 1
Ruff . . . . . . 1 . 1 . . 1 . . . .
Jack Snipe . . . . 1 . . . . . . . . . . .
Snipe 9 4 6 3 3 5 2 1 1 4 2 5 5 3 3 7
Woodcock 1 . 1 . 1 1 . . . . 2 . . 1 . 1
Black-tailed Godwit . 3 . 1 2 3 3 . 2 1 3 4 7 3 4 3
Bar-tailed Godwit . . . . . . . . . . 1 1 1 3 . 1
Whimbrel 3 2 3 4 2 7 3 . 7 4 6 3 4 3 2 3
Curlew 8 11 16 19 17 18 15 . 13 3 15 9 12 17 17 15
Common Sandpiper 2 . 1 3 1 1 1 . 1 1 5 3 2 2 1 .
Green Sandpiper . 1 1 1 1 . . . 1 1 . . 1 1 3 1
Spotted Redshank . 1 . . . 1 . . . . . . . 1 . .
Greenshank 2 . 2 2 . . 4 . 1 . 5 1 . 3 1 .
Wood Sandpiper . . . . . . . . . 1 . . . 1 . .
Redshank 9 9 10 7 8 10 12 6 12 7 11 8 11 15 9 12
Turnstone 2 . 2 1 . 2 . . 2 . 1 1 3 1 2 2
Black-headed Gull 51 59 67 90 69 65 59 22 55 59 61 67 92 106 87 108
Little Gull 1 1 . . . . . . . . . 1 . . 1 .
Mediterranean Gull . . . . . . . 1 . . . . 1 . 2 1
Common Gull 9 11 18 13 16 14 9 3 12 15 12 14 14 22 17 19
Lesser Black-backed Gull 42 47 58 79 77 62 60 28 62 56 80 71 88 105 90 95
Herring Gull 26 26 40 48 51 46 39 11 35 38 44 52 65 78 51 71
Yellow-legged Gull . . . . . . . . 1 . . . . . . .
Great Black-backed Gull 7 5 5 9 13 5 5 1 5 5 4 5 11 14 5 10
Little Tern 1 . 2 1 1 3 . . . . . 2 2 1 1 3
Black Tern . 1 . . 1 . . . . . . . . 1 1 1
Sandwich Tern 1 . . 1 . . . . 2 . . . . . . .
Common Tern 13 12 10 16 18 27 16 3 17 13 19 27 31 29 26 28
Arctic Tern . . . . . . . . . . . . . . 1 1
Rock Dove . . . . . . . . . . . . 1 . . .
Feral Pigeon 48 59 61 77 82 84 59 28 63 54 68 77 87 95 78 80
Stock Dove 86 112 100 122 115 143 109 47 110 108 120 141 158 169 139 153
Woodpigeon 215 251 255 297 290 299 250 105 250 233 257 313 364 434 361 364
Collared Dove 124 153 158 185 184 200 176 74 179 156 175 229 249 293 237 239
Turtle Dove 68 88 89 101 110 110 88 40 71 72 74 78 66 60 49 51
Cockatiel . . . . . . . . . . . . . . . 1
Ring-necked Parakeet . . 1 . . . . . . . . 1 . 1 2 4
Cuckoo 124 134 141 144 149 139 119 25 81 65 94 107 128 126 94 82
Barn Owl 2 5 3 5 5 8 8 4 5 13 12 15 19 29 30 33
Little Owl 10 12 12 18 10 16 16 11 12 17 10 8 20 22 18 21
Tawny Owl 5 9 12 6 10 16 11 9 6 9 10 6 12 19 9 13
Long-eared Owl 1 1 . 1 . . . . . . . . . . . .
Short-eared Owl . . 1 1 . 2 1 . . 1 . 2 . 1 1 .
Nightjar . . . . . . . . . . . . . 1 . .
Swift 121 125 127 141 145 149 122 57 125 121 131 172 198 179 171 176
Kingfisher 5 7 6 6 6 6 6 1 13 6 8 5 15 14 10 10
Green Woodpecker 61 69 88 112 136 139 134 53 130 119 132 181 224 248 216 211
Great Spotted Woodpecker 66 83 97 111 110 125 100 45 113 94 125 144 193 216 187 192
Lesser Spotted Woodpecker 6 3 7 1 4 7 4 1 3 5 2 3 4 2 1 .
Woodlark 2 3 2 2 5 10 10 2 5 5 6 5 7 6 3 3
Skylark 192 216 222 258 256 261 220 88 214 203 218 269 310 365 306 301
Sand Martin 9 13 14 14 13 18 11 3 10 8 14 16 18 16 10 12
Swallow 163 164 182 195 191 208 168 74 166 151 183 233 268 304 258 269
House Martin 79 88 98 97 82 95 79 37 77 81 105 114 135 136 107 115
Tree Pipit 4 6 3 7 2 7 5 1 3 3 5 5 6 7 5 6
Meadow Pipit 31 34 31 35 40 44 31 11 25 30 43 55 61 52 50 51
Rock Pipit . . . . 1 . 1 . . . . . . 1 . .
Water Pipit . . . . . 1 . . . . . . . . . .
Yellow Wagtail 35 57 53 53 54 57 47 16 38 34 41 51 44 36 43 48
Grey Wagtail 2 6 2 6 7 10 6 2 14 7 3 18 20 17 17 14
Pied Wagtail 86 110 116 125 130 153 126 50 134 129 130 174 182 214 183 179
Wren 197 232 230 258 261 277 234 97 233 216 241 294 336 403 335 326
Dunnock 170 206 205 231 224 250 206 84 211 192 202 268 301 359 299 315
Robin 181 225 221 262 256 267 232 94 235 216 235 290 340 404 340 340
Nightingale 13 7 6 10 10 14 8 2 11 11 9 8 15 11 8 6
Black Redstart . . . . 1 . . . . . 1 . . . . .
Redstart 2 3 4 4 3 4 2 . 2 1 2 1 3 3 . 2
Whinchat 2 2 2 3 . 1 2 . 2 3 . 1 1 3 . .
Stonechat 2 . . 1 . 3 1 . . 3 1 1 1 3 1 1
Wheatear 9 12 12 11 17 8 8 1 7 5 6 12 13 15 17 10
Ring Ouzel . 1 . 1 1 1 . . 1 1 2 1 1 1 2 1
Blackbird 210 247 249 286 279 294 245 104 247 230 249 307 359 421 353 353
Fieldfare 3 4 4 4 3 1 2 1 1 12 2 2 6 4 12 1
Song Thrush 162 182 186 178 191 197 176 78 186 175 182 227 273 316 276 268
Redwing . . 2 . 1 . 2 . . 5 . 3 5 2 1 .
Mistle Thrush 102 131 138 155 152 163 128 44 117 115 117 140 153 171 133 132
Cettis Warbler . . . . . 1 1 1 1 1 3 4 1 6 6 14
Grasshopper Warbler 8 5 3 4 5 5 4 1 1 1 4 4 4 6 2 4
Sedge Warbler 35 43 46 41 43 51 34 24 40 34 45 40 55 54 49 53
Reed Warbler 30 34 35 37 38 41 34 17 34 30 44 46 50 48 45 46
Blackcap 141 169 164 180 203 218 190 78 172 155 194 223 272 305 254 267
Garden Warbler 38 63 54 66 56 72 60 15 39 40 51 59 66 62 64 54
Lesser Whitethroat 50 64 77 42 61 65 58 22 43 46 56 79 91 90 82 91
Whitethroat 150 175 199 214 228 220 200 78 196 178 198 240 287 311 272 279
Wood Warbler 3 2 1 . 1 . 1 . . . . . . 1 . 1
Chiffchaff 104 119 115 141 171 137 141 45 137 151 175 193 205 269 255 237
Willow Warbler 131 160 150 152 146 151 124 39 96 75 86 96 111 136 96 108
Goldcrest 32 52 44 51 48 62 57 14 55 68 72 79 85 98 94 57
Firecrest . . . . . . 2 . . . . . 1 . 1 .
Spotted Flycatcher 28 27 40 29 28 21 30 12 16 12 28 20 24 23 12 17
Pied Flycatcher . . . . . 1 . . . . . . . 1 . .
Bearded Tit . . . . . . . . . 1 1 1 1 1 1 1
Long-tailed Tit 86 106 82 94 100 125 130 35 93 111 122 147 162 198 188 189
Blue Tit 193 224 224 278 265 279 232 92 234 216 239 293 341 406 335 338
Great Tit 179 217 212 244 252 261 221 84 218 198 219 281 327 385 329 324
Coal Tit 41 47 43 53 45 58 46 16 47 42 44 59 68 70 62 80
Willow Tit 8 8 9 3 4 3 3 1 1 1 2 1 1 3 3 3
Marsh Tit 11 19 17 25 16 24 18 4 11 17 14 17 17 22 11 21
Nuthatch 19 18 25 24 21 31 15 10 19 16 25 21 27 34 31 28
Treecreeper 21 23 38 30 21 32 26 7 16 19 23 20 40 37 18 30
Golden Oriole . . 1 . . 1 . . . . . . 1 . . .
Jay 67 75 62 86 77 93 84 29 86 81 83 102 144 145 144 149
Magpie 146 184 183 208 207 220 180 86 188 185 182 238 276 323 278 270
Jackdaw 103 143 146 187 175 183 165 61 158 151 176 217 246 273 269 253
Rook 115 139 147 170 167 157 141 48 154 136 146 170 217 244 198 205
Carrion Crow 195 207 222 262 252 263 223 96 226 219 232 297 342 407 349 348
Hooded Crow . . . . . . . . . . . 1 . . . 1
Raven . . . . . . . . . . . 1 . . 1 2
Starling 183 222 217 238 236 242 198 90 196 178 182 244 270 308 249 243
House Sparrow 164 182 185 211 200 211 166 67 159 157 164 203 225 250 203 202
Tree Sparrow 10 18 12 9 10 9 7 1 7 2 5 5 3 4 3 4
Chaffinch 199 240 238 281 276 290 242 102 244 230 250 308 360 425 356 356
Brambling . 1 1 1 2 . 1 1 . 1 . . 1 . . .
Greenfinch 158 189 189 229 209 228 202 82 206 204 220 270 316 360 290 299
Goldfinch 133 147 144 164 149 171 151 58 135 126 153 188 222 265 219 255
Siskin 2 8 3 3 2 4 1 3 6 3 4 4 10 5 2 8
Linnet 132 157 161 179 174 181 145 50 150 138 143 153 166 165 145 163
Twite . . . . . . . . . . . . 1 . . .
Lesser Redpoll 4 4 6 4 3 2 3 . 3 2 4 . 7 1 4 5
Crossbill 1 4 . 3 5 2 1 . 2 3 2 2 3 1 2 3
Bullfinch 49 52 61 56 58 62 46 25 44 63 48 60 64 71 62 74
Hawfinch . . 1 1 . . . . . . . . . 1 . .
Yellowhammer 156 186 188 218 205 217 186 70 174 158 169 204 243 280 232 236
Reed Bunting 49 68 66 64 62 74 45 19 54 55 62 88 102 113 82 93
Corn Bunting 52 49 41 45 40 45 35 12 31 27 30 30 37 38 40 31
Total number of Species 131 133 139 142 134 143 140 112 132 137 142 146 150 162 152 149

 


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