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feathers
Annual birding calendar
Number of unique species observed on each calendar day (across all years).
January
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
February
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
March
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
April
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
May
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
June
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
July
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
August
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
September
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
October
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
November
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
December
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
19
20
21
22
23
24
25
26
27
28
29
30
31
19
20
21
22
23
24
25
26
27
28
29
30
19
20
21
22
23
24
25
26
27
28
29
30
31
19
20
21
22
23
24
25
26
27
28
29
30
19
20
21
22
23
24
25
26
27
28
29
30
31
19
20
21
22
23
24
25
26
27
28
29
30
31
19
20
21
22
23
24
25
26
27
28
29
30
19
20
21
22
23
24
25
26
27
28
29
30
31
19
20
21
22
23
24
25
26
27
28
29
30
19
20
21
22
23
24
25
26
27
28
29
30
31
