BBS

Number of 1km squares in which each species
was recorded in South East 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	233	266	277	326	356	388	435	197	425	441	449	521	591	624
Mute Swan	19	26	30	37	40	43	47	27	51	54	56	64	74	76
Whooper Swan	.	.	.	.	.	.	.	.	1	1	.	.	1	.
Pink-footed Goose	.	.	.	.	1	.	.	.	.	.	.	.	.	.
White-fronted Goose	.	.	.	.	.	1	.	.	.	.	.	.	.	.
Greylag Goose	7	12	16	15	18	21	25	3	21	27	28	35	41	39
Feral/hybrid Goose	.	.	.	.	1	.	2	1	1	.	.	4	4	3
Snow Goose	1	.	.	.	.	.	.	.	.	.	.	.	.	.
Canada Goose	40	56	64	75	77	100	113	29	104	112	122	122	130	141
Barnacle Goose	.	.	1	1	1	1	1	.	.	1	2	2	2	2
Brent Goose	.	.	1	.	1	.	1	.	1	.	.	.	2	2
Egyptian Goose	.	.	.	.	.	1	.	1	.	2	2	7	7	7
Ruddy Shelduck	.	.	.	.	.	.	.	.	.	.	.	.	1	.
Shelduck	14	14	15	16	22	19	23	8	16	17	21	26	26	29
Mandarin	4	2	.	1	4	8	9	4	9	8	17	10	21	15
Wigeon	.	.	1	.	.	.	2	1	1	1	3	1	2	3
Gadwall	2	4	4	4	7	10	13	6	9	10	15	20	16	17
Teal	.	5	1	4	2	3	3	1	3	4	5	7	10	6
Mallard	105	117	128	147	174	180	221	85	210	214	216	260	281	307
Feral/hybrid mallard type	.	.	.	1	.	.	.	.	2	1	6	6	3	8
Pintail	.	.	.	.	.	.	.	.	.	.	.	.	.	2
Garganey	.	.	.	.	.	.	.	.	.	.	.	1	.	.
Shoveler	4	4	1	3	3	5	6	1	5	5	5	10	4	4
Red-crested Pochard	.	.	.	.	.	.	.	.	1	.	.	.	.	.
Pochard	5	4	4	6	3	7	7	2	5	4	6	9	9	7
Tufted Duck	14	18	15	15	16	24	32	12	25	29	26	34	34	33
Scaup	.	.	.	.	1	.	.	.	.	.	.	.	.	.
Eider	.	.	.	1	.	.	.	.	.	.	.	.	.	.
Long-tailed Duck	.	.	1	.	.	.	.	.	.	.	.	.	.	.
Goldeneye	1	1	.	.	.	.	.	1	1	.	.	.	.	.
Red-breasted Merganser	.	.	.	.	.	.	.	.	.	.	1	.	1	.
Goosander	.	2	1	2	.	2	.	.	1	4	1	1	1	2
Ruddy Duck	1	1	1	.	.	.	.	.	3	2	2	6	3	2
Red Grouse	.	.	.	.	.	.	1	.	.	.	.	.	.	.
Capercaillie	.	.	.	.	.	.	.	.	.	.	.	.	1	.
Red-legged Partridge	33	40	58	65	79	76	84	29	96	109	137	166	174	163
Grey Partridge	30	25	31	40	29	27	46	9	45	37	35	51	33	33
Quail	.	3	3	4	5	2	.	.	2	3	2	4	3	2
Pheasant	170	194	214	246	269	292	344	121	339	358	366	422	480	511
Golden Pheasant	.	.	1	.	1	.	.	.	.	.	1	.	.	.
Red-throated Diver	.	.	.	.	1	.	1	.	.	.	.	.	.	.
Little Grebe	3	7	8	8	10	14	21	9	21	19	22	18	20	17
Great Crested Grebe	6	6	6	6	5	6	11	9	11	13	12	21	17	14
Black-necked Grebe	.	.	.	1	.	.	.	.	.	.	.	.	.	.
Fulmar	1	1	.	1	3	2	1	.	1	1	1	1	3	3
Gannet	2	1	.	1	1	1	.	.	.	1	2	1	2	1
Cormorant	8	16	14	16	23	21	42	18	44	42	51	58	71	79
Shag	1	.	.	.	.	.	.	.	.	.	.	.	.	.
Little Egret	.	.	.	.	.	.	1	3	6	7	13	16	15	16
Grey Heron	52	65	61	75	83	98	119	55	117	125	114	162	141	170
Glossy Ibis	.	.	.	.	.	.	.	.	.	.	1	.	.	.
Honey Buzzard	.	.	.	.	.	.	1	.	.	.	.	.	.	.
Red Kite	1	2	3	3	4	7	9	5	18	29	32	46	57	78
Marsh Harrier	1	1	4	1	5	2	3	.	4	3	2	4	3	4
Hen Harrier	.	.	.	.	.	2	1	.	.	.	.	1	.	.
Montagus Harrier	.	.	1	.	1	.	1	.	.	.	1	.	1	.
Goshawk	1	.	.	.	.	1	1	.	1	.	1	.	.	.
Sparrowhawk	35	35	35	51	63	55	63	30	63	72	68	90	86	83
Buzzard	11	14	10	24	37	39	55	19	79	103	115	137	170	195
Osprey	1	.	.	1	.	.	.	.	1	.	.	.	.	.
Kestrel	83	84	68	95	122	106	119	52	124	154	104	156	175	161
Merlin	.	.	.	.	.	.	.	.	.	.	1	.	.	.
Hobby	6	7	7	11	10	12	16	9	12	14	13	18	13	13
Peregrine	1	1	1	2	2	4	2	1	3	2	6	2	1	8
Water Rail	1	.	1	.	1	1	.	.	1	1	2	3	3	.
Corncrake	.	1	.	.	.	1	.	.	.	.	.	.	.	.
Moorhen	72	85	80	93	109	128	157	64	149	138	142	167	191	190
Coot	22	29	29	36	45	50	61	31	54	64	57	77	83	86
Oystercatcher	6	6	8	10	8	10	9	3	9	8	11	11	12	15
Avocet	1	2	2	3	3	4	2	1	3	4	2	4	2	.
Stone-curlew	.	.	.	.	.	.	.	.	1	.	.	.	.	1
Little Ringed Plover	.	2	.	.	1	.	1	1	.	3	1	2	.	1
Ringed Plover	3	3	3	2	4	4	5	2	3	6	2	6	4	3
Golden Plover	.	.	.	.	2	.	2	.	1	3	1	.	1	2
Grey Plover	.	1	.	1	.	1	1	.	.	.	.	.	1	.
Lapwing	67	72	90	80	87	85	125	33	102	129	124	136	126	126
Dunlin	.	1	1	.	1	1	2	3	2	1	.	1	.	.
Ruff	.	1	.	.	.	.	.	.	.	.	.	.	.	.
Snipe	2	5	3	4	4	4	3	.	4	6	5	2	6	2
Woodcock	.	1	.	.	1	1	.	.	3	3	2	2	1	5
Black-tailed Godwit	1	.	.	.	.	.	1	.	1	.	1	1	2	1
Bar-tailed Godwit	.	1	1	.	1	.	.	.	.	1	.	.	.	2
Whimbrel	3	3	4	3	4	4	1	1	3	.	3	1	7	4
Curlew	13	11	8	9	11	17	18	6	17	15	14	14	18	24
Spotted Redshank	.	.	.	.	.	1	.	.	.	.	.	.	.	.
Redshank	7	10	10	13	13	15	16	5	15	14	19	20	15	20
Greenshank	.	.	1	4	.	3	2	1	1	1	.	2	.	3
Green Sandpiper	.	.	1	.	1	.	1	.	2	2	1	2	.	3
Common Sandpiper	2	2	2	3	1	1	5	1	2	5	.	2	2	1
Turnstone	.	.	.	1	.	.	2	.	.	.	.	1	.	3
Mediterranean Gull	.	.	.	.	1	2	2	.	5	3	3	1	8	10
Black-headed Gull	42	49	48	56	62	56	67	27	71	54	65	87	111	131
Common Gull	6	3	4	3	6	10	9	4	2	6	1	9	14	17
Lesser Black-backed Gull	13	13	18	24	25	27	23	11	37	39	41	52	57	75
Herring Gull	19	24	29	43	66	63	79	34	64	80	73	117	156	172
Yellow-legged Gull	1	.	.	.	.	.	.	.	.	.	.	.	.	.
Great Black-backed Gull	1	.	2	3	.	3	3	2	3	5	7	10	13	16
Kittiwake	.	.	.	.	.	1	.	.	.	.	.	.	.	.
Sandwich Tern	1	1	.	1	2	1	2	1	2	1	2	5	5	6
Common Tern	6	6	2	7	11	8	15	4	18	16	12	26	24	26
Little Tern	.	1	1	.	2	2	.	.	2	.	1	1	.	1
Black Tern	.	.	1	.	.	.	.	.	.	.	.	.	.	.
Guillemot	.	.	.	.	1	.	.	.	.	.	.	.	.	.
Rock Dove	.	.	.	.	.	.	.	.	.	.	.	.	1	.
Feral Pigeon	57	85	75	85	108	110	111	57	106	106	101	121	136	129
Stock Dove	103	121	106	129	155	177	177	73	176	182	173	197	215	228
Woodpigeon	231	263	276	320	351	383	430	195	421	437	444	515	587	614
Collared Dove	151	166	172	211	228	252	280	119	257	270	278	333	373	381
Turtle Dove	41	43	57	55	77	63	72	25	60	57	57	60	49	57
Ring-necked Parakeet	4	4	4	6	5	13	18	10	21	27	36	35	42	49
Cuckoo	125	154	143	172	170	187	199	65	147	154	181	168	200	180
Barn Owl	2	.	.	2	3	1	.	3	2	8	7	13	16	10
Little Owl	17	16	18	25	21	26	30	9	21	27	23	28	26	35
Tawny Owl	16	11	11	18	13	15	22	6	19	23	20	28	23	34
Long-eared Owl	.	.	1	.	.	.	.	.	1	.	.	2	.	.
Short-eared Owl	.	.	.	.	1	.	.	.	.	1	.	.	1	.
Nightjar	.	1	.	.	.	.	.	.	1	1	1	2	2	2
Swift	125	118	122	121	157	156	180	97	164	171	166	203	198	202
Kingfisher	4	12	9	8	9	11	7	1	8	18	12	14	15	14
Hoopoe	.	.	.	.	.	.	.	.	1	.	1	1	.	.
Wryneck	.	.	.	.	.	.	.	.	.	.	1	.	.	.
Green Woodpecker	128	144	150	179	229	260	280	104	266	273	291	338	384	404
Great Spotted Woodpecker	100	134	138	141	186	205	237	92	234	277	281	341	389	392
Lesser Spotted Woodpecker	10	4	8	8	7	8	11	4	5	10	10	10	10	11
Woodlark	4	4	5	5	5	4	9	6	7	7	7	11	13	18
Skylark	164	189	203	228	255	265	290	117	283	283	294	350	383	390
Sand Martin	5	8	11	7	5	7	13	10	12	13	8	11	11	12
Swallow	157	161	175	213	232	253	300	108	264	272	278	352	403	391
House Martin	100	105	107	124	121	127	171	77	147	151	152	173	209	168
Tree Pipit	15	11	11	11	16	13	18	10	11	10	14	14	16	13
Meadow Pipit	24	27	35	42	45	41	45	11	38	42	49	71	66	60
Rock Pipit	.	1	1	.	1	1	1	2	.	.	1	1	.	1
Yellow Wagtail	21	22	30	26	21	25	24	8	26	24	23	23	25	19
Grey Wagtail	14	12	14	15	16	20	20	13	23	27	23	26	32	45
Pied Wagtail	104	116	123	130	153	187	197	80	199	218	209	240	252	262
Waxwing	.	.	.	.	.	.	.	.	.	.	.	1	.	.
Wren	224	255	262	299	329	363	411	181	409	424	418	495	555	589
Dunnock	200	239	243	266	302	340	387	161	359	389	389	463	515	538
Robin	221	252	263	304	328	368	412	181	405	425	430	506	565	599
Nightingale	10	11	11	18	18	22	23	3	17	11	9	19	16	26
Black Redstart	1	.	.	.	1	1	1	.	.	.	1	.	1	.
Redstart	.	2	1	4	2	2	9	6	8	8	10	10	14	13
Whinchat	4	1	5	3	2	2	.	1	3	3	1	2	2	4
Stonechat	8	7	6	6	9	13	10	6	11	13	12	14	19	19
Wheatear	6	10	11	12	6	12	13	4	16	14	17	24	29	26
Ring Ouzel	.	.	.	.	.	.	.	.	.	2	.	1	1	2
Blackbird	229	261	274	322	352	382	429	196	419	437	445	516	588	616
Fieldfare	.	4	5	4	3	6	3	1	5	22	11	3	10	1
Song Thrush	200	231	245	273	293	318	366	164	372	394	392	452	517	523
Redwing	.	1	2	.	1	.	.	.	4	6	3	1	.	1
Mistle Thrush	152	170	171	188	211	225	242	84	237	241	246	265	267	278
Cettis Warbler	1	1	3	2	2	4	4	1	6	4	5	11	15	14
Grasshopper Warbler	3	4	1	4	4	3	4	1	1	2	4	4	4	6
Sedge Warbler	16	15	22	25	30	25	44	20	38	30	37	41	44	41
Marsh Warbler	.	.	.	.	1	.	.	.	.	.	1	.	1	.
Reed Warbler	9	12	20	21	29	24	30	15	25	27	28	41	41	42
Blackcap	159	178	176	232	274	307	338	148	335	329	361	402	464	447
Garden Warbler	53	66	76	77	99	90	101	37	82	85	82	103	105	117
Lesser Whitethroat	47	39	41	32	39	32	52	16	48	53	55	55	73	78
Whitethroat	118	137	183	194	201	215	259	107	270	258	283	312	374	367
Dartford Warbler	2	2	2	1	4	4	4	4	2	4	7	7	10	9
Wood Warbler	4	2	.	3	3	5	2	2	5	4	5	2	2	5
Chiffchaff	152	172	179	205	255	255	276	115	302	357	359	371	394	454
Willow Warbler	133	135	153	144	157	172	164	60	143	139	145	171	154	179
Goldcrest	89	100	102	109	114	148	175	75	171	195	178	215	234	250
Firecrest	2	1	.	.	1	1	2	3	3	3	1	3	4	7
Spotted Flycatcher	34	25	25	30	42	38	48	15	30	41	30	27	33	24
Pied Flycatcher	.	.	.	1	2	1	1	.	1	.	.	.	2	.
Bearded Tit	.	.	.	1	1	.	1	.	1	.	1	2	2	1
Long-tailed Tit	123	123	135	140	162	182	224	73	179	224	212	265	274	291
Marsh Tit	28	29	31	32	43	40	50	18	52	51	52	56	64	67
Willow Tit	12	14	15	13	16	11	11	5	7	9	6	10	10	10
Coal Tit	74	68	79	88	102	111	132	49	124	136	133	155	183	189
Blue Tit	225	257	267	311	341	374	414	185	408	430	435	508	577	604
Great Tit	222	242	255	297	323	357	408	166	393	418	426	491	568	588
Nuthatch	71	85	88	97	108	117	122	58	139	154	165	187	200	226
Treecreeper	57	54	59	62	65	86	73	23	72	85	64	94	98	101
Jay	121	120	121	152	145	168	178	78	207	206	217	240	277	293
Magpie	206	235	242	277	315	337	372	157	357	360	372	433	499	525
Jackdaw	163	172	184	226	243	267	302	126	299	304	332	384	430	473
Rook	129	152	154	161	170	184	206	67	205	197	218	255	304	319
Carrion Crow	216	247	253	300	338	369	413	181	400	420	434	493	567	599
Hooded Crow	.	.	.	.	.	1	.	.	.	.	.	.	.	.
Raven	.	.	.	.	1	.	1	.	1	1	4	.	8	5
Starling	208	237	240	281	293	333	342	145	317	312	306	372	392	435
House Sparrow	170	195	210	228	243	260	274	115	263	271	274	324	358	377
Tree Sparrow	13	16	13	10	6	9	10	.	5	7	5	4	5	5
Chaffinch	220	256	264	308	341	372	420	186	411	428	434	508	578	603
Brambling	1	.	.	2	1	1	4	.	1	3	2	.	3	2
Serin	.	.	.	.	.	.	.	.	.	.	.	.	.	1
Greenfinch	182	210	226	261	278	314	347	161	332	352	375	431	497	504
Goldfinch	148	163	182	181	212	209	257	105	245	264	277	322	351	381
Siskin	3	3	1	6	7	2	9	3	6	3	2	5	17	8
Linnet	138	156	161	199	199	210	227	94	211	244	230	241	227	242
Twite	.	.	.	.	1	.	.	.	.	.	.	.	1	.
Lesser Redpoll	9	7	9	8	14	4	3	2	6	7	6	8	13	3
Crossbill	3	.	.	3	6	.	5	2	1	11	5	3	10	3
Bullfinch	92	89	100	123	112	99	127	44	115	118	131	162	134	139
Hawfinch	.	1	.	.	.	.	2	.	.	1	.	.	1	1
Yellowhammer	152	168	172	200	208	211	242	83	228	229	233	257	290	301
Reed Bunting	36	39	40	47	31	48	48	24	52	59	55	75	81	79
Corn Bunting	27	24	29	30	25	33	22	15	25	31	21	27	37	36
Black Swan	.	.	.	.	1	1	2	1	2	1	2	2	2	2
Swan Goose	.	.	.	.	.	.	.	.	.	.	.	.	.	1
Bar-headed Goose	.	.	.	.	.	.	1	.	.	.	1	.	.	1
Australian Shelduck	.	.	1	.	.	.	.	.	.	.	.	.	.	.
Muscovy Duck	.	.	.	1	.	1	.	.	2	.	.	.	.	.
Carolina Wood Duck	.	.	1	.	.	.	.	.	.	.	1	.	.	.
Reeves Pheasant	.	.	.	.	.	.	.	.	1	.	1	.	.	.
Peafowl	1	1	1	1	.	1	3	.	.	1	2	6	8	10
Helmeted Guineafowl	.	.	1	.	1	.	.	.	.	1	1	.	3	2
Alexandrine Parakeet	.	.	1	.	.	1	.	.	.	.	.	.	.	.
Other cage bird species	.	.	.	.	.	.	.	.	1	.	.	.	.	.
Total number of Species	133	138	140	138	154	149	151	129	158	151	161	155	160	159

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