BBS

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	10
Total No squares surveyed	216	251	255	298	290	300	251	107	252	236	258	314	368	438	366	368	352
Mute Swan	30	26	35	35	38	45	27	14	27	34	36	41	49	51	51	50	43
Black Swan	.	.	.	1	1	1	2	1	1	.	.	.	.	.	.	.	.
Whooper Swan	.	.	.	.	.	1	.	.	.	.	.	.	.	.	.	.	.
Pink-footed Goose	.	.	.	.	.	.	.	.	.	.	.	.	.	1	2	.	.
White-fronted Goose	.	.	1	.	.	.	.	.	.	.	.	.	.	.	1	.	1
Greylag Goose	11	15	22	16	25	27	22	4	22	36	34	40	52	58	51	53	64
Feral/hybrid Goose	.	.	.	.	.	.	.	.	2	.	5	4	6	5	6	4	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	59
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	2
Black brant	.	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.	.
Egyptian Goose	2	2	.	4	7	5	7	.	6	8	11	10	9	16	15	16	16
Ruddy Shelduck	.	.	.	.	.	.	.	.	.	.	.	.	.	2	.	.	.
Shelduck	22	28	29	36	43	41	38	12	29	27	35	34	41	47	27	34	30
Muscovy Duck	.	.	.	.	.	1	1	.	.	.	1	.	.	.	.	.	.
Carolina Wood Duck	.	.	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.
Mandarin	.	1	1	4	.	1	2	.	1	2	.	1	4	2	2	2	3
Wigeon	.	.	1	2	.	.	1	.	.	1	1	.	.	1	1	2	1
Gadwall	7	4	6	9	9	7	7	6	6	6	9	7	10	19	13	13	10
Teal	1	2	2	.	.	2	1	.	4	2	3	2	5	5	4	7	6
Mallard	122	136	144	153	162	177	144	45	151	134	165	190	231	264	219	225	212
Feral/hybrid mallard type	.	.	.	.	.	.	2	1	3	4	3	5	6	12	12	15	11
Pintail	.	.	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.
Garganey	.	.	.	.	.	2	2	.	.	.	.	.	.	.	1	.	.
Shoveler	3	2	5	2	3	3	6	1	3	2	4	3	7	5	5	8	3
Red-crested Pochard	.	.	.	1	.	.	.	.	.	.	1	.	1	.	.	.	.
Pochard	2	3	2	2	2	.	4	1	.	2	4	4	3	5	3	6	6
Tufted Duck	26	19	24	24	29	30	24	11	21	19	24	27	30	35	26	37	23
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	.	1
Helmeted Guineafowl	.	.	.	.	.	.	.	.	.	.	3	6	3	4	3	4	2
Red-legged Partridge	124	148	157	172	171	170	138	50	141	132	156	176	208	240	203	187	181
Grey Partridge	38	47	51	55	50	41	41	7	30	24	31	51	48	55	45	26	34
Quail	2	7	1	8	4	4	3	1	4	.	1	5	2	2	1	2	1
Pheasant	173	203	216	249	236	255	223	83	213	201	229	269	327	382	318	310	300
Golden Pheasant	1	4	1	.	.	.	.	.	.	.	1	2	2	.	.	.	.
Peafowl	1	.	.	5	7	4	5	2	3	4	5	8	11	10	9	11	8
Little Grebe	5	7	10	10	9	6	8	3	11	5	8	12	17	10	11	10	6
Great Crested Grebe	13	17	15	12	18	16	11	5	11	9	14	13	17	22	17	21	13
Black-necked Grebe	.	.	.	.	.	1	1	1	1	1	1	1	1	1	1	1	1
Fulmar	.	.	.	1	.	.	.	.	.	.	.	.	.	.	.	.	.
Gannet	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.	.	1
Cormorant	19	31	29	35	33	49	42	12	42	37	36	51	65	68	58	60	56
Shag	.	.	.	.	1	1	.	.	.	.	.	.	.	.	.	.	.
Bittern	.	.	.	.	.	.	.	.	.	.	3	.	2	.	2	2	2
Little Egret	.	.	.	.	.	.	.	.	.	3	5	8	5	12	14	14	16
Grey Heron	53	58	54	70	56	93	52	25	70	70	59	98	118	127	103	106	78
Honey Buzzard	.	.	.	.	1	.	.	.	.	.	.	.	.	.	.	.	.
Red Kite	.	1	.	.	.	.	.	.	.	.	.	5	7	7	13	12	24
Marsh Harrier	3	4	5	4	9	12	6	.	10	9	9	11	14	19	17	14	12
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	54	63	55
Buzzard	1	2	1	3	5	8	7	4	8	15	21	24	46	64	60	97	87
Osprey	.	2	1	1	.	.	.	.	.	.	.	2	.	.	.	.	.
Kestrel	86	99	85	100	84	110	95	27	66	89	60	113	135	158	140	116	106
Merlin	.	.	.	.	.	.	.	.	1	.	.	.	.	.	.	2	.
Hobby	7	5	8	6	5	5	5	5	9	5	6	9	12	21	9	15	10
Peregrine	.	.	.	.	1	2	2	.	.	.	.	.	.	2	1	.	3
Water Rail	1	1	1	.	.	.	.	.	.	1	.	1	.	1	1	1	1
Corncrake	.	.	.	.	.	.	.	.	.	.	.	.	.	.	.	1	.
Moorhen	82	110	101	97	100	131	102	43	102	100	100	131	152	189	146	160	131
Coot	24	30	26	28	38	38	33	7	30	29	39	45	47	66	54	49	45
Crane	.	.	.	.	.	.	.	.	.	.	1	1	1	1	1	1	.
Oystercatcher	13	15	19	23	22	22	22	7	27	26	27	27	32	49	41	44	30
Avocet	.	.	.	1	1	1	2	.	.	1	2	.	4	4	5	5	3
Stone-curlew	3	1	3	3	5	4	4	.	2	1	1	1	.	.	.	2	1
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	3
Golden Plover	2	.	.	2	.	2	.	.	.	1	1	2	1	2	2	1	.
Grey Plover	.	1	1	.	.	1	2	.	.	.	.	1	3	1	.	.	2
Lapwing	49	66	71	66	64	70	50	23	59	60	74	85	95	102	91	93	85
Dunlin	.	.	2	2	.	.	1	.	.	2	.	.	2	2	1	1	.
Ruff	.	.	.	.	.	.	1	.	1	.	.	1	.	.	.	.	1
Jack Snipe	.	.	.	.	1	.	.	.	.	.	.	.	.	.	.	.	.
Snipe	9	4	6	3	3	5	2	1	1	4	2	5	5	3	3	7	4
Woodcock	1	.	1	.	1	1	.	.	.	.	2	.	.	1	.	1	.
Black-tailed Godwit	.	3	.	1	2	3	3	.	2	1	3	4	7	3	4	3	1
Bar-tailed Godwit	.	.	.	.	.	.	.	.	.	.	1	1	1	3	.	1	.
Whimbrel	3	2	3	4	2	7	3	.	7	4	6	3	4	3	2	3	3
Curlew	8	11	16	19	17	18	15	.	13	3	15	9	12	17	17	15	6
Common Sandpiper	2	.	1	3	1	1	1	.	1	1	5	3	2	2	1	.	1
Green Sandpiper	.	1	1	1	1	.	.	.	1	1	.	.	1	1	3	1	1
Spotted Redshank	.	1	.	.	.	1	.	.	.	.	.	.	.	1	.	.	.
Greenshank	2	.	2	2	.	.	4	.	1	.	5	1	.	3	1	.	2
Wood Sandpiper	.	.	.	.	.	.	.	.	.	1	.	.	.	1	.	.	.
Redshank	9	9	10	7	8	10	12	6	12	7	11	8	11	15	10	12	11
Turnstone	2	.	2	1	.	2	.	.	2	.	1	1	3	1	2	2	2
Black-headed Gull	51	59	67	90	69	65	59	22	55	59	61	67	92	106	88	109	85
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	14
Lesser Black-backed Gull	42	47	58	79	77	62	60	28	62	56	80	71	88	105	91	95	97
Herring Gull	26	26	40	48	51	46	39	11	35	38	44	52	65	78	52	73	63
Yellow-legged Gull	.	.	.	.	.	.	.	.	1	.	.	.	.	.	.	.	.
Great Black-backed Gull	7	5	5	9	13	5	5	1	5	5	4	5	11	14	5	10	7
Little Tern	1	.	2	1	1	3	.	.	.	.	.	2	2	1	1	3	2
Black Tern	.	1	.	.	1	.	.	.	.	.	.	.	.	1	1	1	.
Sandwich Tern	1	.	.	1	.	.	.	.	2	.	.	.	.	.	.	.	1
Common Tern	13	12	10	16	18	27	16	3	17	13	19	27	31	29	29	29	28
Arctic Tern	.	.	.	.	.	.	.	.	.	.	.	.	.	.	1	1	.
Rock Dove	.	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.	.
Feral Pigeon	48	59	61	77	82	84	59	28	63	54	68	77	87	95	79	80	75
Stock Dove	86	112	100	122	115	143	109	47	110	108	120	141	158	169	141	153	129
Woodpigeon	215	251	255	297	290	299	250	105	250	233	257	313	364	435	365	368	350
Collared Dove	124	153	158	185	184	200	176	74	179	156	175	229	249	293	238	241	239
Turtle Dove	68	88	89	101	110	110	88	40	71	72	74	78	66	60	50	51	41
Cockatiel	.	.	.	.	.	.	.	.	.	.	.	.	.	.	.	1	.
Ring-necked Parakeet	.	.	1	.	.	.	.	.	.	.	.	1	.	1	2	4	4
Cuckoo	124	134	141	144	149	139	119	25	81	65	94	107	128	127	94	83	90
Barn Owl	2	5	3	5	5	8	8	4	5	13	12	15	19	29	31	33	27
Little Owl	10	12	12	18	10	16	16	11	12	17	10	8	20	22	18	21	24
Tawny Owl	5	9	12	6	10	16	11	9	6	9	10	6	12	19	9	13	12
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	174	177	154
Kingfisher	5	7	6	6	6	6	6	1	13	6	8	5	15	14	10	11	4
Green Woodpecker	61	69	88	112	136	139	134	53	130	119	132	181	224	248	220	212	209
Great Spotted Woodpecker	66	83	97	111	110	125	100	45	113	94	125	144	193	216	192	193	182
Lesser Spotted Woodpecker	6	3	7	1	4	7	4	1	3	5	2	3	4	2	1	.	2
Woodlark	2	3	2	2	5	10	10	2	5	5	6	5	7	6	3	3	3
Skylark	192	216	222	258	256	261	220	88	214	203	218	269	310	366	309	304	290
Sand Martin	9	13	14	14	13	18	11	3	10	8	14	16	18	16	10	12	9
Swallow	163	164	182	195	191	208	168	74	166	151	183	233	268	304	261	271	256
House Martin	79	88	98	97	82	95	79	37	77	81	105	114	135	136	109	116	89
Tree Pipit	4	6	3	7	2	7	5	1	3	3	5	5	6	7	5	6	4
Meadow Pipit	31	34	31	35	40	44	31	11	25	30	43	55	61	52	50	52	39
Rock Pipit	.	.	.	.	1	.	1	.	.	.	.	.	.	1	.	.	.
Water Pipit	.	.	.	.	.	1	.	.	.	.	.	.	.	.	.	.	.
Yellow Wagtail	35	57	53	53	54	57	47	16	38	34	41	51	44	36	44	48	41
Grey Wagtail	2	6	2	6	7	10	6	2	14	7	3	18	20	17	17	14	8
Pied Wagtail	86	110	116	125	130	153	126	50	134	129	130	174	182	215	184	179	139
Wren	197	232	230	258	261	277	234	97	233	216	241	294	336	404	339	329	322
Dunnock	170	206	205	231	224	250	206	84	211	192	202	268	301	360	302	316	306
Robin	181	225	221	262	256	267	232	94	235	216	235	290	340	404	343	343	325
Nightingale	13	7	6	10	10	14	8	2	11	11	9	8	15	11	8	6	4
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	.	.	1
Stonechat	2	.	.	1	.	3	1	.	.	3	1	1	1	3	1	1	2
Wheatear	9	12	12	11	17	8	8	1	7	5	6	12	13	15	17	10	25
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	422	357	357	345
Fieldfare	3	4	4	4	3	1	2	1	1	12	2	2	6	4	12	1	4
Song Thrush	162	182	186	178	191	197	176	78	186	175	182	227	273	316	279	268	267
Redwing	.	.	2	.	1	.	2	.	.	5	.	3	5	2	1	.	1
Mistle Thrush	102	131	138	155	152	163	128	44	117	115	117	140	153	171	134	132	120
Cettis Warbler	.	.	.	.	.	1	1	1	1	1	3	4	1	6	6	14	9
Grasshopper Warbler	8	5	3	4	5	5	4	1	1	1	4	4	4	6	2	4	5
Sedge Warbler	35	43	46	41	43	51	34	24	40	34	45	40	55	55	51	53	43
Reed Warbler	30	34	35	37	38	41	34	17	34	30	44	46	50	48	46	47	42
Blackcap	141	169	164	180	203	218	190	78	172	155	194	223	272	305	257	268	284
Garden Warbler	38	63	54	66	56	72	60	15	39	40	51	59	66	62	65	54	60
Lesser Whitethroat	50	64	77	42	61	65	58	22	43	46	56	79	91	90	84	91	77
Whitethroat	150	175	199	214	228	220	200	78	196	178	198	240	287	312	275	281	281
Wood Warbler	3	2	1	.	1	.	1	.	.	.	.	.	.	1	.	1	.
Chiffchaff	104	119	115	141	171	137	141	45	137	151	175	193	205	269	258	237	250
Willow Warbler	131	160	150	152	146	151	124	39	96	75	86	96	111	136	96	108	100
Goldcrest	32	52	44	51	48	62	57	14	55	68	72	79	85	98	97	57	76
Firecrest	.	.	.	.	.	.	2	.	.	.	.	.	1	.	1	.	2
Spotted Flycatcher	28	27	40	29	28	21	30	12	16	12	28	20	24	23	12	18	9
Pied Flycatcher	.	.	.	.	.	1	.	.	.	.	.	.	.	1	.	.	.
Bearded Tit	.	.	.	.	.	.	.	.	.	1	1	1	1	1	1	1	3
Long-tailed Tit	86	106	82	94	100	125	130	35	93	111	122	147	162	198	192	191	211
Blue Tit	193	224	224	278	265	279	232	92	234	216	239	293	341	406	338	340	341
Great Tit	179	217	212	244	252	261	221	84	218	198	219	281	327	385	331	326	330
Coal Tit	41	47	43	53	45	58	46	16	47	42	44	59	68	70	63	80	91
Willow Tit	8	8	9	3	4	3	3	1	1	1	2	1	1	3	3	3	1
Marsh Tit	11	19	17	25	16	24	18	4	11	17	14	17	17	22	13	21	16
Nuthatch	19	18	25	24	21	31	15	10	19	16	25	21	27	34	32	28	37
Treecreeper	21	23	38	30	21	32	26	7	16	19	23	20	40	37	18	31	30
Golden Oriole	.	.	1	.	.	1	.	.	.	.	.	.	1	.	.	.	.
Jay	67	75	62	86	77	93	84	29	86	81	83	102	144	145	146	150	138
Magpie	146	184	183	208	207	220	180	86	188	185	182	238	276	324	282	273	270
Jackdaw	103	143	146	187	175	183	165	61	158	151	176	217	246	274	272	255	250
Rook	115	139	147	170	167	157	141	48	154	136	146	170	217	244	199	206	199
Carrion Crow	195	207	222	262	252	263	223	96	226	219	232	297	342	408	353	351	337
Hooded Crow	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.	1	.
Raven	.	.	.	.	.	.	.	.	.	.	.	1	.	.	1	2	2
Starling	183	222	217	238	236	242	198	90	196	178	182	244	270	309	251	246	219
House Sparrow	164	182	185	211	200	211	166	67	159	157	164	203	225	250	205	203	207
Tree Sparrow	10	18	12	9	10	9	7	1	7	2	5	5	3	4	3	4	2
Chaffinch	199	240	238	281	276	290	242	102	244	230	250	308	360	425	359	360	348
Brambling	.	1	1	1	2	.	1	1	.	1	.	.	1	.	.	.	.
Greenfinch	158	189	189	229	209	228	202	82	206	204	220	270	316	361	292	302	277
Goldfinch	133	147	144	164	149	171	151	58	135	126	153	188	222	266	224	256	247
Siskin	2	8	3	3	2	4	1	3	6	3	4	4	10	5	2	9	5
Linnet	132	157	161	179	174	181	145	50	150	138	143	153	166	166	146	164	160
Twite	.	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.	.
Lesser Redpoll	4	4	6	4	3	2	3	.	3	2	4	.	7	1	4	5	1
Crossbill	1	4	.	3	5	2	1	.	2	3	2	2	3	1	2	3	5
Bullfinch	49	52	61	56	58	62	46	25	44	63	48	60	64	71	64	74	74
Hawfinch	.	.	1	1	.	.	.	.	.	.	.	.	.	1	.	.	.
Yellowhammer	156	186	188	218	205	217	186	70	174	158	169	204	243	280	233	237	234
Reed Bunting	49	68	66	64	62	74	45	19	54	55	62	88	102	114	85	94	87
Corn Bunting	52	49	41	45	40	45	35	12	31	27	30	30	37	38	40	31	31
Total number of Species	131	133	139	142	134	143	140	112	132	137	142	146	150	162	152	149	145

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The Breeding Bird Survey (BBS) monitors terrestrial birds throughout the UK to
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