IBA Species Data for South Twin Lake

These two tables show the data collected on criteria species and species concentrations as defined by the IBA technical committee. The data comes from the original IBA data collection process, Iowa Seasonal Field Reports, and the recent Breeding Bird Atlas project (2008-2012).

Criteria Species

Species	Date	Number	Comments
Black-billed Cuckoo	7/20/2024	2	CHECKLIST
Black-billed Cuckoo	8/21/2022	1	CHECKLIST
Black-billed Cuckoo	8/8/2022	1	CHECKLIST
Black-billed Cuckoo	8/30/1998	1
Piping Plover	8/6/2024	1	CHECKLIST
Piping Plover	8/6/2024	1	CHECKLIST
Piping Plover	8/4/2024	1	CHECKLIST
Piping Plover	8/4/2024	1	CHECKLIST
Piping Plover	6/7/2024	1
American Woodcock	4/8/2022	2	CHECKLIST
Black Tern	5/25/2025	3	CHECKLIST
Black Tern	5/18/2025	20	CHECKLIST
Black Tern	5/18/2025	1	CHECKLIST
Black Tern	5/16/2025	150	CHECKLIST
Black Tern	5/10/2025	2	CHECKLIST
Black Tern	8/17/2024	1	CHECKLIST
Black Tern	8/16/2024	3	CHECKLIST
Black Tern	8/9/2024	2	CHECKLIST
Black Tern	8/8/2024	2	CHECKLIST
Black Tern	8/8/2024	3	CHECKLIST
Black Tern	8/4/2024	2	CHECKLIST
Black Tern	7/29/2024	1	CHECKLIST
Black Tern	7/27/2024	2	CHECKLIST
Black Tern	7/27/2024	4	CHECKLIST
Black Tern	7/22/2024	4	CHECKLIST
Black Tern	7/20/2024	2	CHECKLIST
Black Tern	7/10/2024	15	CHECKLIST
Black Tern	7/7/2024	15	CHECKLIST
Black Tern	7/3/2024	15	CHECKLIST
Black Tern	6/30/2024	1	CHECKLIST
Black Tern	6/30/2024	1	CHECKLIST
Black Tern	6/29/2024	6	CHECKLIST
Black Tern	6/25/2024	3	CHECKLIST
Black Tern	6/24/2024	3	CHECKLIST
Black Tern	6/22/2024	4	CHECKLIST
Black Tern	6/14/2024	5	CHECKLIST
Black Tern	6/11/2024	48	CHECKLIST
Black Tern	7/30/2023	1	CHECKLIST
Black Tern	7/20/2023	2	CHECKLIST
Black Tern	7/15/2023	4	CHECKLIST
Black Tern	7/4/2023	2	CHECKLIST
Black Tern	7/1/2023	1	CHECKLIST
Black Tern	7/1/2023	1	CHECKLIST
Black Tern	6/30/2023	1	CHECKLIST
Black Tern	5/21/2023	10	CHECKLIST
Black Tern	8/29/2022	2	CHECKLIST
Black Tern	8/29/2022	40	CHECKLIST
Black Tern	8/27/2022	12	CHECKLIST
Black Tern	8/27/2022	14	CHECKLIST
Black Tern	8/27/2022	20	CHECKLIST
Black Tern	8/27/2022	25	CHECKLIST
Black Tern	8/21/2022	2	CHECKLIST
Black Tern	8/16/2022	1	CHECKLIST
Black Tern	8/16/2022	1	CHECKLIST
Black Tern	8/16/2022	1	CHECKLIST
Black Tern	8/8/2022	4	CHECKLIST
Black Tern	7/23/2022	3	CHECKLIST
Black Tern	7/23/2022	3	CHECKLIST
Black Tern	5/23/2022	32	CHECKLIST
Black Tern	5/15/2016	250	Large flock foraging over the lake before flying to the east. CHECKLIST
Black Tern	5/17/2008	194
Forster's Tern	5/24/2025	1	CHECKLIST
Forster's Tern	5/10/2025	9	CHECKLIST
Forster's Tern	8/16/2024	5	CHECKLIST
Forster's Tern	8/8/2024	1	CHECKLIST
Forster's Tern	8/8/2024	1	CHECKLIST
Forster's Tern	8/8/2024	4	CHECKLIST
Forster's Tern	8/4/2024	6	CHECKLIST
Forster's Tern	7/30/2024	5	CHECKLIST
Forster's Tern	7/22/2024	1	CHECKLIST
Forster's Tern	7/10/2024	2	CHECKLIST
Forster's Tern	7/3/2024	1	CHECKLIST
Forster's Tern	6/30/2024	1	CHECKLIST
Forster's Tern	6/30/2024	1	CHECKLIST
Forster's Tern	6/29/2024	3	CHECKLIST
Forster's Tern	6/25/2024	4	CHECKLIST
Forster's Tern	6/23/2024	1	CHECKLIST
Forster's Tern	7/30/2023	4	CHECKLIST
Forster's Tern	7/15/2023	3	CHECKLIST
Forster's Tern	7/1/2023	1	CHECKLIST
Forster's Tern	7/1/2023	1	CHECKLIST
Forster's Tern	6/30/2023	3	CHECKLIST
Forster's Tern	10/30/2022	2	CHECKLIST
Forster's Tern	8/29/2022	5	CHECKLIST
Forster's Tern	8/16/2022	2	CHECKLIST
Forster's Tern	8/16/2022	2	CHECKLIST
Forster's Tern	8/16/2022	2	CHECKLIST
Forster's Tern	8/8/2022	1	CHECKLIST
Black-crowned Night Heron	8/21/2022	1	CHECKLIST
Black-crowned Night Heron	7/28/2022	1	CHECKLIST
Northern Harrier	7/3/2023	1	CHECKLIST
Northern Harrier	4/29/2023	1	CHECKLIST
Northern Harrier	4/7/2023	1	CHECKLIST
Northern Harrier	4/2/2023	1	CHECKLIST
Northern Harrier	4/1/2023	1	CHECKLIST
Northern Harrier	10/14/2022	1	CHECKLIST
Northern Harrier	10/7/2022	1	CHECKLIST
Northern Harrier	10/13/2008	1	juv.
Northern Harrier	9/29/2008	3	1 ad. fem., 1 ad. male, 1 juv.
Northern Harrier	11/7/2007	1	fem.
Northern Harrier	11/2/2007	1	fem.
Northern Harrier	10/1/2007	1
Northern Harrier	4/6/2007	1	female
Northern Harrier	3/26/2007	1	female
Northern Harrier	10/17/2006	1	juv.
Bald Eagle	5/25/2025	1	CHECKLIST
Bald Eagle	4/27/2025	1	CHECKLIST
Bald Eagle	4/21/2025	1	CHECKLIST
Bald Eagle	7/30/2024	1	CHECKLIST
Bald Eagle	6/30/2024	1	CHECKLIST
Bald Eagle	6/30/2024	1	CHECKLIST
Bald Eagle	7/15/2023	2	CHECKLIST
Bald Eagle	7/8/2023	1	CHECKLIST
Bald Eagle	7/3/2023	1	CHECKLIST
Bald Eagle	7/1/2023	4	CHECKLIST
Bald Eagle	7/1/2023	4	CHECKLIST
Bald Eagle	6/30/2023	1	CHECKLIST
Bald Eagle	5/28/2023	1	CHECKLIST
Bald Eagle	5/25/2023	1	CHECKLIST
Bald Eagle	5/13/2023	1	CHECKLIST
Bald Eagle	4/29/2023	1	CHECKLIST
Bald Eagle	4/22/2023	1	CHECKLIST
Bald Eagle	4/2/2023	1	CHECKLIST
Bald Eagle	3/25/2023	1	CHECKLIST
Bald Eagle	10/8/2022	1	CHECKLIST
Bald Eagle	10/8/2022	1	CHECKLIST
Bald Eagle	9/15/2022	1	CHECKLIST
Bald Eagle	9/11/2022	2	CHECKLIST
Bald Eagle	9/11/2022	2	CHECKLIST
Bald Eagle	9/11/2022	2	CHECKLIST
Bald Eagle	9/3/2022	1	CHECKLIST
Bald Eagle	8/27/2022	1	CHECKLIST
Bald Eagle	8/21/2022	1	CHECKLIST
Bald Eagle	8/8/2022	1	CHECKLIST
Bald Eagle	4/8/2022	2	CHECKLIST
Bald Eagle	3/13/2022	98	CHECKLIST
Broad-winged Hawk	4/29/2023	1	CHECKLIST
Broad-winged Hawk	9/17/2022	1	CHECKLIST
Long-eared Owl	3/28/2015	1
Peregrine Falcon	8/4/2024	1	CHECKLIST
Peregrine Falcon	9/11/2022	1	CHECKLIST
Peregrine Falcon	9/11/2022	1	CHECKLIST
Peregrine Falcon	9/11/2022	1	CHECKLIST
Peregrine Falcon	10/13/2008	1
Bell's Vireo	7/30/2024	1	CHECKLIST
Veery	9/1/2024	1	CHECKLIST
Veery	9/3/2022	1	CHECKLIST
Grasshopper Sparrow	5/24/2025	1	CHECKLIST
Grasshopper Sparrow	7/27/2024	2	CHECKLIST
Grasshopper Sparrow	7/20/2024	2	CHECKLIST
Grasshopper Sparrow	7/4/2024	1	CHECKLIST
Grasshopper Sparrow	7/15/2023	2	CHECKLIST
Grasshopper Sparrow	7/4/2023	1	CHECKLIST
Grasshopper Sparrow	7/1/2023	1	CHECKLIST
Bobolink	5/18/2025	1	CHECKLIST
Bobolink	5/14/2025	2	CHECKLIST
Bobolink	7/4/2024	3	CHECKLIST
Bobolink	6/30/2024	2	CHECKLIST
Bobolink	6/30/2024	2	CHECKLIST
Bobolink	6/22/2024	1	CHECKLIST
Bobolink	7/1/2023	2	CHECKLIST
Bobolink	5/25/2023	1	CHECKLIST
Bobolink	5/13/2023	1	CHECKLIST
Bobolink	8/21/2022	1	CHECKLIST
Bobolink	6/21/2022	6	CHECKLIST

Species Concentrations

Species Name/Group	Date	Number
American Coot	4/13/2008	2,800
Double-crested Cormorant	4/20/2011	705
Waterfowl	3/5/2017	1,138
Waterfowl	3/3/2017	7,306
Waterfowl	4/11/2009	2,065
Waterfowl	4/3/2009	3,737
Waterfowl	11/10/2008	1,850
Waterfowl	10/20/2008	1,604
Waterfowl	11/12/2007	6,132
Waterfowl	11/7/2007	6,613
Waterfowl	11/6/2007	8,762
Waterfowl	11/2/2007	8,933
Waterfowl	4/17/2007	10,816
Waterfowl	4/6/2007	1,649
Waterfowl	3/26/2007	1,130
Waterfowl	11/9/2006	1,494
Waterfowl	10/23/2006	1,696
Waterfowl	3/29/2006	5,385