Horseshoe Crab in Worcester Co., Maryland (1/18/2022). (c) Ilana, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 536489 - Psn: 25)

Horseshoe Crab in Worcester Co., Maryland (1/18/2022). (c) Ilana, some rights reserved (CC BY-NC).

View Record Details Photo by Ilana via iNaturalist MBP List

Cast Horseshoe Crab exoskeletons at Swan Creek in Anne Arundel Co., Maryland (7/26/2015).

View Record Details Photo by Bill Hubick MBP List

A Horseshoe Crab returning to the ocean in Worcester Co., Maryland (4/8/2017).

View Record Details Photo by Thomas Wilson MBP List

Horseshoe Crab in Worcester Co., Maryland (9/3/2022). (c) Nick Denny Photo, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 924709 - Psn: 35)

Horseshoe Crab in Worcester Co., Maryland (9/3/2022). (c) Nick Denny Photo, some rights reserved (CC BY-NC).

View Record Details Photo by Nick Denny Photo via iNaturalist MBP List

The underside of a Horseshoe Crab in Worcester Co., Maryland (4/8/2017).

View Record Details Photo by Thomas Wilson MBP List

Horseshoe Crabs in Anne Arundel Co., Maryland (7/13/2018).

View Record Details Photo by Matthew Beziat MBP List

Horseshoe Crab in Worcester Co., Maryland (8/22/2021). (c) Jim Brighton, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 436861 - Psn: 55)

Horseshoe Crab in Worcester Co., Maryland (8/22/2021). (c) Jim Brighton, some rights reserved (CC BY-NC).

View Record Details Photo by Jim Brighton MBP List

Horseshoe Crab in Talbot Co., Maryland (11/22/2016).

View Record Details Photo by Wayne Longbottom MBP List

A Horseshoe Crab in Talbot Co., Maryland (6/2/2013).

View Record Details Photo by Jared Satchell MBP List

A Horseshoe Crab in Calvert Co., Maryland (8/1/2015).

View Record Details Photo by Jane Kostenko MBP List

Horseshoe Crabs in Queen Anne's Co., Maryland (5/28/2016).

View Record Details Photo by Sheila Maestas MBP List

Horseshoe Crab in Calvert Co., Maryland (9/8/2021). (c) jprowinski, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 496705 - Psn: 88)

Horseshoe Crab in Calvert Co., Maryland (9/8/2021). (c) jprowinski, some rights reserved (CC BY-NC).

View Record Details Photo by jprowinski via iNaturalist MBP List

Horseshoe Crab in Worcester Co., Maryland (3/13/2022). (c) bev435, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 657880 - Psn: 88)

Horseshoe Crab in Worcester Co., Maryland (3/13/2022). (c) bev435, some rights reserved (CC BY-NC).

View Record Details Photo by bev435 via iNaturalist MBP List

A Horseshoe Crab in Calvert Co., Maryland (5/5/2017).

View Record Details Photo by Jim Stasz MBP List

Horseshoe Crab in Worcester Co., Maryland (10/21/2021). (c) Micah Fletcher, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 482206 - Psn: 90)

Horseshoe Crab in Worcester Co., Maryland (10/21/2021). (c) Micah Fletcher, some rights reserved (CC BY-NC).

View Record Details Photo by Micah Fletcher via iNaturalist MBP List

A Horseshoe Crab in Worcester Co., Maryland (5/27/2016).

View Record Details Photo by Bill Hubick MBP List

Horseshoe Crabs in Worcester Co., Maryland (8/22/2022). (c) danieltayloroc, some rights reserved (<a rel='license' href='https://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 632199 - Psn: 110)

Horseshoe Crabs in Worcester Co., Maryland (8/22/2022). (c) danieltayloroc, some rights reserved (CC BY-NC).

View Record Details Photo by danieltayloroc via iNaturalist MBP List

Spawning Horseshoe Crabs supporting spring migration along Delaware Bay (5/20/2006).

Photo by Bill Hubick MBP List

Horseshoe Crab in Worcester Co., Maryland (6/1/2019). (c) darnoldd, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1171740 - Psn: 125)

Horseshoe Crab in Worcester Co., Maryland (6/1/2019). (c) darnoldd, some rights reserved (CC BY-NC).

View Record Details Photo by darnoldd via iNaturalist MBP List

Horseshoe Crabs along the Chesapeake Bay in Anne Arundel Co., Maryland (6/17/2017).

View Record Details Photo by Lynn Strauss MBP List

Horseshoe Crabs along the Chesapeake Bay in Anne Arundel Co., Maryland (6/3/2016).

View Record Details Photo by Lynn Strauss MBP List

Horseshoe Crab in Anne Arundel Co., Maryland (6/7/2018). (c) josh rudder, some rights reserved (CC BY-NC).

View Record Details Photo by josh_rudder via iNaturalist MBP List

Horseshoe Crab in Queen Anne's Co., Maryland (6/6/2013). (c) 116916927065934112165, some rights reserved (CC BY-NC-ND).

View Record Details Photo by Matt Muir via iNaturalist MBP List

Horseshoe Crab in Queen Anne's Co., Maryland (11/27/2021). (c) Emilio Concari, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 490242 - Psn: 180)

Horseshoe Crab in Queen Anne's Co., Maryland (11/27/2021). (c) Emilio Concari, some rights reserved (CC BY-NC).

View Record Details Photo by Emilio Concari MBP List

Horseshoe Crabs spawning in Calvert Co., Maryland (6/1/2017).

View Record Details Photo by Tyler Bell MBP List

The eggs of Horseshoe Crab in Anne Arundel Co., Maryland (6/10/2011).

View Record Details Photo by Lynn Strauss MBP List

Horseshoe Crab in Worcester Co., Maryland (5/25/2021). (c) Shelley Tender, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 384323 - Psn: 200)

Horseshoe Crab in Worcester Co., Maryland (5/25/2021). (c) Shelley Tender, some rights reserved (CC BY-NC).

View Record Details Photo by Shelley Tender via iNaturalist MBP List

Horseshoe Crab in St. Mary's Co., Maryland (10/18/2025). (c) Seth Shively, some rights reserved (CC BY-NC)

View Record Details Photo by Seth Shively via iNaturalist MBP List

Horseshoe Crab in Worcester Co., Maryland (5/2/2026). (c) Sydney Jackson, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>) (Photo ID: 1500030 - Psn: 200)

Horseshoe Crab in Worcester Co., Maryland (5/2/2026). (c) Sydney Jackson, some rights reserved (CC BY-NC)

View Record Details Photo by Sydney Jackson via iNaturalist MBP List

A Horseshoe Crab in St. Mary's Co., Maryland (9/19/2015).

View Record Details Photo by Tyler Bell MBP List

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Use of media featured on Maryland Biodiversity Project is only permitted with express permission of the photographer.

Horseshoe Crab in Worcester Co., Maryland (1/18/2022). (c) Ilana, some rights reserved (CC BY-NC). View Record Details Media by Ilana via iNaturalist.

Cast Horseshoe Crab exoskeletons at Swan Creek in Anne Arundel Co., Maryland (7/26/2015). View Record Details Media by Bill Hubick.

A Horseshoe Crab returning to the ocean in Worcester Co., Maryland (4/8/2017). View Record Details Media by Thomas Wilson.

Horseshoe Crab in Worcester Co., Maryland (9/3/2022). (c) Nick Denny Photo, some rights reserved (CC BY-NC). View Record Details Media by Nick Denny Photo via iNaturalist.

The underside of a Horseshoe Crab in Worcester Co., Maryland (4/8/2017). View Record Details Media by Thomas Wilson.

Horseshoe Crabs in Anne Arundel Co., Maryland (7/13/2018). View Record Details Media by Matthew Beziat.

Horseshoe Crab in Worcester Co., Maryland (8/22/2021). (c) Jim Brighton, some rights reserved (CC BY-NC). View Record Details Media by Jim Brighton.

Horseshoe Crab in Talbot Co., Maryland (11/22/2016). View Record Details Media by Wayne Longbottom.

A Horseshoe Crab in Talbot Co., Maryland (6/2/2013). View Record Details Media by Jared Satchell.

A Horseshoe Crab in Calvert Co., Maryland (8/1/2015). View Record Details Media by Jane Kostenko.

Horseshoe Crabs in Queen Anne's Co., Maryland (5/28/2016). View Record Details Media by Sheila Maestas.

Horseshoe Crab in Calvert Co., Maryland (9/8/2021). (c) jprowinski, some rights reserved (CC BY-NC). View Record Details Media by jprowinski via iNaturalist.

Horseshoe Crab in Worcester Co., Maryland (3/13/2022). (c) bev435, some rights reserved (CC BY-NC). View Record Details Media by bev435 via iNaturalist.

A Horseshoe Crab in Calvert Co., Maryland (5/5/2017). View Record Details Media by Jim Stasz.

Horseshoe Crab in Worcester Co., Maryland (10/21/2021). (c) Micah Fletcher, some rights reserved (CC BY-NC). View Record Details Media by Micah Fletcher via iNaturalist.

A Horseshoe Crab in Worcester Co., Maryland (5/27/2016). View Record Details Media by Bill Hubick.

Horseshoe Crabs in Worcester Co., Maryland (8/22/2022). (c) danieltayloroc, some rights reserved (CC BY-NC). View Record Details Media by danieltayloroc via iNaturalist.

Spawning Horseshoe Crabs supporting spring migration along Delaware Bay (5/20/2006). Media by Bill Hubick.

Horseshoe Crab in Worcester Co., Maryland (6/1/2019). (c) darnoldd, some rights reserved (CC BY-NC). View Record Details Media by darnoldd via iNaturalist.

Horseshoe Crabs along the Chesapeake Bay in Anne Arundel Co., Maryland (6/17/2017). View Record Details Media by Lynn Strauss.

Horseshoe Crabs along the Chesapeake Bay in Anne Arundel Co., Maryland (6/3/2016). View Record Details Media by Lynn Strauss.

Horseshoe Crab in Anne Arundel Co., Maryland (6/7/2018). (c) josh rudder, some rights reserved (CC BY-NC). View Record Details Media by josh_rudder via iNaturalist.

Horseshoe Crab in Queen Anne's Co., Maryland (6/6/2013). (c) 116916927065934112165, some rights reserved (CC BY-NC-ND). View Record Details Media by Matt Muir via iNaturalist.

Horseshoe Crab in Queen Anne's Co., Maryland (11/27/2021). (c) Emilio Concari, some rights reserved (CC BY-NC). View Record Details Media by Emilio Concari.

Horseshoe Crabs spawning in Calvert Co., Maryland (6/1/2017). View Record Details Media by Tyler Bell.

The eggs of Horseshoe Crab in Anne Arundel Co., Maryland (6/10/2011). View Record Details Media by Lynn Strauss.

Horseshoe Crab in Worcester Co., Maryland (5/25/2021). (c) Shelley Tender, some rights reserved (CC BY-NC). View Record Details Media by Shelley Tender via iNaturalist.

Horseshoe Crab in St. Mary's Co., Maryland (10/18/2025). (c) Seth Shively, some rights reserved (CC BY-NC) View Record Details Media by Seth Shively via iNaturalist.

Horseshoe Crab in Worcester Co., Maryland (5/2/2026). (c) Sydney Jackson, some rights reserved (CC BY-NC) View Record Details Media by Sydney Jackson via iNaturalist.

A Horseshoe Crab in St. Mary's Co., Maryland (9/19/2015). View Record Details Media by Tyler Bell.