IBA Species Data for Big Marsh

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	Breeding Status	Comments
Black-billed Cuckoo	8/12/2022	1		CHECKLIST
Black-billed Cuckoo	6/24/2011		PO-X
Black-billed Cuckoo	8/24/2008	1
American Woodcock	6/9/2024	1		CHECKLIST
American Woodcock	3/15/2023	1		CHECKLIST
American Woodcock	3/25/2006	7		displaying males seen and heard
Black Tern	5/23/2025	1		CHECKLIST
Black Tern	7/7/2024	1		CHECKLIST
Black Tern	6/10/2024	1		CHECKLIST
Black Tern	6/9/2024	11		CHECKLIST
Black Tern	5/17/2023	1		CHECKLIST
Black Tern	5/23/2020	1		FOY
Black Tern	5/11/2015	3
Forster's Tern	7/30/2015	2
Black-crowned Night Heron	8/31/2003	1
Northern Harrier	4/19/2025	1		CHECKLIST
Northern Harrier	4/6/2025	1		CHECKLIST
Northern Harrier	4/6/2025	1		CHECKLIST
Northern Harrier	3/29/2025	1		CHECKLIST
Northern Harrier	3/25/2025	6		CHECKLIST
Northern Harrier	3/24/2025	1		CHECKLIST
Northern Harrier	12/9/2024	1		CHECKLIST
Northern Harrier	12/9/2024	1		CHECKLIST
Northern Harrier	12/8/2024	2		CHECKLIST
Northern Harrier	12/8/2024	2		CHECKLIST
Northern Harrier	12/7/2024	1		CHECKLIST
Northern Harrier	12/7/2024	1		CHECKLIST
Northern Harrier	11/15/2024	5		CHECKLIST
Northern Harrier	11/8/2024	1		CHECKLIST
Northern Harrier	11/8/2024	2		CHECKLIST
Northern Harrier	10/15/2024	2		CHECKLIST
Northern Harrier	6/9/2024	1		CHECKLIST
Northern Harrier	4/9/2023	1		CHECKLIST
Northern Harrier	4/9/2023	1		CHECKLIST
Northern Harrier	4/3/2023	1		CHECKLIST
Northern Harrier	3/20/2023	1		CHECKLIST
Northern Harrier	3/17/2023	1		CHECKLIST
Northern Harrier	3/15/2023	1		CHECKLIST
Northern Harrier	3/1/2023	1		CHECKLIST
Northern Harrier	11/24/2022	1		CHECKLIST
Northern Harrier	11/5/2022	1		CHECKLIST
Northern Harrier	11/5/2022	1		CHECKLIST
Northern Harrier	3/6/2022	1		CHECKLIST
Northern Harrier	9/19/2020	2
Northern Harrier	4/20/2020	1
Northern Harrier	10/9/2017	11		Personal high count for Aug-Nov 2017. CHECKLIST
Northern Harrier	1/29/2010	1
Northern Harrier	1/29/2010	1	OB-O	Observed hunting in the vicinity of a Rough-legged Hawk and Bald Eagle.
Northern Harrier	10/7/2009	3	PO-H	Observed pair of Northern Harrier sparring with Crows.
Northern Harrier	9/19/2009	1	PO-H	Prairie Rapids Audubon trip to Big Marsh. Francis Moore, leader, also observed the Harrier flying over the marsh.
Northern Harrier	8/17/2009	1	PO-H	Female (brown) observed harassing several American Crows.
Northern Harrier	7/14/2009		PR-P
Northern Harrier	6/15/2008	1		1 female
Northern Harrier	4/2/2008		PO-H
Northern Harrier	8/14/2006	1	OB-O	adult female in flight over summer territory
Northern Harrier	3/25/2006	7		5 ad. males, 2 ad. females
Northern Harrier	3/19/2006	8		5 ad. males, 3 ad. females
Northern Harrier	2/12/2005	1
Northern Harrier	11/25/2002	2
Bald Eagle	4/27/2025	4		CHECKLIST
Bald Eagle	4/25/2025	7		CHECKLIST
Bald Eagle	4/19/2025	1		CHECKLIST
Bald Eagle	4/6/2025	2		CHECKLIST
Bald Eagle	4/6/2025	1		CHECKLIST
Bald Eagle	3/30/2025	2		CHECKLIST
Bald Eagle	3/29/2025	3		CHECKLIST
Bald Eagle	3/28/2025	1		CHECKLIST
Bald Eagle	3/25/2025	9		CHECKLIST
Bald Eagle	3/24/2025	2		CHECKLIST
Bald Eagle	3/16/2025	32		CHECKLIST
Bald Eagle	3/11/2025	228		CHECKLIST
Bald Eagle	3/9/2025	26		CHECKLIST
Bald Eagle	3/8/2025	82		CHECKLIST
Bald Eagle	2/10/2025	4		CHECKLIST
Bald Eagle	2/10/2025	4		CHECKLIST
Bald Eagle	2/2/2025	2		CHECKLIST
Bald Eagle	2/2/2025	2		CHECKLIST
Bald Eagle	1/12/2025	1		CHECKLIST
Bald Eagle	1/12/2025	1		CHECKLIST
Bald Eagle	12/16/2024	1		CHECKLIST
Bald Eagle	12/16/2024	1		CHECKLIST
Bald Eagle	12/9/2024	3		CHECKLIST
Bald Eagle	12/9/2024	3		CHECKLIST
Bald Eagle	12/8/2024	2		CHECKLIST
Bald Eagle	12/8/2024	2		CHECKLIST
Bald Eagle	12/7/2024	3		CHECKLIST
Bald Eagle	12/7/2024	1		CHECKLIST
Bald Eagle	12/7/2024	1		CHECKLIST
Bald Eagle	12/7/2024	1		CHECKLIST
Bald Eagle	12/7/2024	1		CHECKLIST
Bald Eagle	12/7/2024	3		CHECKLIST
Bald Eagle	11/21/2024	1		CHECKLIST
Bald Eagle	11/16/2024	3		CHECKLIST
Bald Eagle	11/10/2024	2		CHECKLIST
Bald Eagle	11/8/2024	3		CHECKLIST
Bald Eagle	10/15/2024	1		CHECKLIST
Bald Eagle	10/9/2024	2		CHECKLIST
Bald Eagle	6/14/2024	1		CHECKLIST
Bald Eagle	6/17/2023	1		CHECKLIST
Bald Eagle	5/17/2023	1		CHECKLIST
Bald Eagle	5/4/2023	1		CHECKLIST
Bald Eagle	4/30/2023	1		CHECKLIST
Bald Eagle	4/30/2023	2		CHECKLIST
Bald Eagle	4/21/2023	3		CHECKLIST
Bald Eagle	4/9/2023	1		CHECKLIST
Bald Eagle	3/20/2023	3		CHECKLIST
Bald Eagle	3/17/2023	4		CHECKLIST
Bald Eagle	3/15/2023	1		CHECKLIST
Bald Eagle	3/15/2023	7		CHECKLIST
Bald Eagle	3/10/2023	24		CHECKLIST
Bald Eagle	3/5/2023	20		CHECKLIST
Bald Eagle	3/4/2023	3		CHECKLIST
Bald Eagle	3/2/2023	7		CHECKLIST
Bald Eagle	3/1/2023	12		CHECKLIST
Bald Eagle	2/19/2023	17		CHECKLIST
Bald Eagle	2/5/2023	3		CHECKLIST
Bald Eagle	12/31/2022	1		CHECKLIST
Bald Eagle	11/24/2022	3		CHECKLIST
Bald Eagle	11/13/2022	1		CHECKLIST
Bald Eagle	11/13/2022	1		CHECKLIST
Bald Eagle	11/5/2022	1		CHECKLIST
Bald Eagle	11/5/2022	1		CHECKLIST
Bald Eagle	9/11/2022	1		CHECKLIST
Bald Eagle	8/12/2022	1		CHECKLIST
Bald Eagle	7/29/2022	6		CHECKLIST
Bald Eagle	7/27/2022	1		CHECKLIST
Bald Eagle	7/8/2022	1		CHECKLIST
Bald Eagle	6/11/2022	1		CHECKLIST
Bald Eagle	5/28/2022	1		CHECKLIST
Bald Eagle	4/29/2022	1		CHECKLIST
Bald Eagle	4/9/2022	2		CHECKLIST
Bald Eagle	3/16/2022	1		CHECKLIST
Bald Eagle	3/15/2022	3		CHECKLIST
Bald Eagle	3/6/2022	1		CHECKLIST
Bald Eagle	3/6/2022	1		CHECKLIST
Bald Eagle	3/6/2022	2		CHECKLIST
Bald Eagle	6/25/2020	2		Adult flying with all dark juvenile.
Bald Eagle	1/29/2010	1	OB-O
Bald Eagle	10/7/2009	2	OB-O
Bald Eagle	9/19/2009	1	OB-O	Prairie Rapids Audubon trip led by Francis Moore.
Bald Eagle	8/17/2009	2	OB-O
Bald Eagle	7/13/2008		PO-H
Bald Eagle	4/2/2008		PO-H
Bald Eagle	3/2/2003	3
Bald Eagle	11/25/2002	6
Bald Eagle	11/16/2000	3
Bald Eagle	12/10/1998	4
Red-shouldered Hawk	5/18/2025	1		CHECKLIST
Red-shouldered Hawk	11/17/2024	1		CHECKLIST
Red-shouldered Hawk	11/16/2024	1		CHECKLIST
Red-shouldered Hawk	11/15/2024	1		CHECKLIST
Red-shouldered Hawk	11/8/2024	1		CHECKLIST
Red-shouldered Hawk	10/9/2024	2		CHECKLIST
Red-shouldered Hawk	3/15/2022	1		CHECKLIST
Red-shouldered Hawk	4/2/2008		PO-X
Broad-winged Hawk	5/18/2025	1		CHECKLIST
Broad-winged Hawk	5/4/2023	1		CHECKLIST
Broad-winged Hawk	9/19/2020	5		FOS
Broad-winged Hawk	4/20/2020	1
Broad-winged Hawk	7/25/2012		PR-T
Broad-winged Hawk	8/14/2006	1	OB-O
Short-eared Owl	12/7/2024	1		CHECKLIST
Short-eared Owl	12/7/2024	1		CHECKLIST
Short-eared Owl	11/26/2024	1		CHECKLIST
Short-eared Owl	2/19/2006	3
Short-eared Owl	3/19/2004	1
Short-eared Owl	12/1/2002	11
Short-eared Owl	12/1/2002	12
Pileated Woodpecker	6/17/2023	1		CHECKLIST
Pileated Woodpecker	5/9/2023	1		CHECKLIST
Pileated Woodpecker	5/11/2019	1
Pileated Woodpecker	7/25/2012		PR-A
Pileated Woodpecker	4/2/2008		PO-H
Peregrine Falcon	4/27/2025	1		CHECKLIST
Peregrine Falcon	4/27/2022	1		CHECKLIST
Peregrine Falcon	5/14/2018	1
Peregrine Falcon	5/11/2015	1
Bell's Vireo	5/18/2025	2		CHECKLIST
Bell's Vireo	6/9/2024	2		CHECKLIST
Bell's Vireo	7/9/2022	1		CHECKLIST
Bell's Vireo	6/26/2022	1		CHECKLIST
Bell's Vireo	5/16/2003	1
Loggerhead Shrike	5/11/2019	1
Loggerhead Shrike	4/20/2019	1
Loggerhead Shrike	7/2/2005	1		Along 310th Street near Big Marsh
Veery	9/11/2022	1		CHECKLIST
Veery	9/13/2008	1
Wood Thrush	5/18/2025	1		CHECKLIST
Wood Thrush	5/10/2025	2		CHECKLIST
Wood Thrush	5/10/2025	2		CHECKLIST
Wood Thrush	6/9/2024	1		CHECKLIST
Wood Thrush	7/1/2023	1		CHECKLIST
Wood Thrush	6/17/2023	2		CHECKLIST
Wood Thrush	4/28/2023	1		CHECKLIST
Wood Thrush	7/8/2022	1		CHECKLIST
Wood Thrush	7/8/2022	1		CHECKLIST
Wood Thrush	6/26/2022	2		CHECKLIST
Wood Thrush	6/5/2020	2
Wood Thrush	7/25/2012		PO-X
Wood Thrush	5/5/2008		PO-H
Grasshopper Sparrow	6/17/2023	1		CHECKLIST
Grasshopper Sparrow	6/17/2023	1		CHECKLIST
Grasshopper Sparrow	7/17/2022	1		CHECKLIST
Grasshopper Sparrow	6/26/2022	1		CHECKLIST
Grasshopper Sparrow	6/26/2022	1		CHECKLIST
Grasshopper Sparrow	6/11/2022	1		CHECKLIST
Grasshopper Sparrow	6/27/2011		PR-T
Grasshopper Sparrow	6/12/2009		PO-X
Grasshopper Sparrow	7/13/2008		PO-X
Henslow's Sparrow	6/9/2024	1		CHECKLIST
Henslow's Sparrow	6/17/2023	1		CHECKLIST
Henslow's Sparrow	7/27/2022	1		CHECKLIST
Henslow's Sparrow	7/9/2022	1		CHECKLIST
Henslow's Sparrow	6/26/2022	2		CHECKLIST
Henslow's Sparrow	10/13/2020	1		Last of the fall 2020 season. Adult, with greenish cast to the flat head. Rufous back .Underside light with dark streaks on sides and breast area. Observed 3-5' off the ground in wet ditch vegetation surrounded by tallgrass prairie.
Henslow's Sparrow	5/14/2018	2
Henslow's Sparrow	6/27/2011		PR-T
Bobolink	5/23/2025	1		CHECKLIST
Bobolink	5/18/2025	1		CHECKLIST
Bobolink	5/10/2025	2		CHECKLIST
Bobolink	5/10/2025	2		CHECKLIST
Bobolink	6/9/2024	1		CHECKLIST
Bobolink	7/8/2023	1		CHECKLIST
Bobolink	7/3/2023	2		CHECKLIST
Bobolink	7/1/2023	2		CHECKLIST
Bobolink	7/1/2023	3		CHECKLIST
Bobolink	6/17/2023	3		CHECKLIST
Bobolink	6/17/2023	4		CHECKLIST
Bobolink	9/11/2022	1		CHECKLIST
Bobolink	7/29/2022	1		CHECKLIST
Bobolink	7/17/2022	2		CHECKLIST
Bobolink	7/9/2022	2		CHECKLIST
Bobolink	7/8/2022	1		CHECKLIST
Bobolink	6/26/2022	3		CHECKLIST
Bobolink	6/26/2022	5		CHECKLIST
Bobolink	6/11/2022	4		CHECKLIST
Bobolink	5/28/2022	2		CHECKLIST
Bobolink	6/5/2020	3
Bobolink	6/21/2018	1
Bobolink	6/30/2015	2		Only two seen/heard on perimeter roads.
Bobolink	6/27/2011		CO-AY
Bobolink	5/28/2011		PO-X
Bobolink	7/14/2009		PR-P
Bobolink	6/29/2009	5	PO-X	Observed west of the mid marsh North/South dike which is located off C51 near the boat ramp(s).
Bobolink	6/12/2009		PO-X
Bobolink	6/12/2009		PR-M
Bobolink	9/13/2008	1

Species Concentrations

Species Name/Group	Date	Number
Waterfowl	2/28/2016	2,962
Waterfowl	3/13/2009	1,001
Waterfowl	10/29/2003	1,500
Waterfowl	11/7/2002	12,625
Waterfowl	12/12/2001	4,800
Waterfowl	11/16/2000	16,150
Waterfowl	11/24/1999	9,400
Waterfowl	12/10/1998	17,400