![20km of barriers, 31 underpasses and 1 bridge: getting ready for the great crab migration. – Christmas Island 20km of barriers, 31 underpasses and 1 bridge: getting ready for the great crab migration. – Christmas Island](https://www.christmas.net.au/wp-content/uploads/2015/10/images_deb_easyblog_images_63_Resized_Crabs_spill_out_from_behind_the_fence_where_the_road_is_closed_to_traffic.jpg)
20km of barriers, 31 underpasses and 1 bridge: getting ready for the great crab migration. – Christmas Island
![Spotted Porcelain Crab - Neopetrolisthes maculatus - Great Barrier Reef, Australia - Photo 18 - Tropical Reefs Spotted Porcelain Crab - Neopetrolisthes maculatus - Great Barrier Reef, Australia - Photo 18 - Tropical Reefs](https://reefguide.org/pix/neopetrolisthesmaculatus18.jpg)
Spotted Porcelain Crab - Neopetrolisthes maculatus - Great Barrier Reef, Australia - Photo 18 - Tropical Reefs
![20km of barriers, 31 underpasses and 1 bridge: getting ready for the great crab migration. – Christmas Island 20km of barriers, 31 underpasses and 1 bridge: getting ready for the great crab migration. – Christmas Island](https://www.christmas.net.au//wp-content/uploads/2015/10/images_deb_easyblog_images_63_Resized_Putting_up_permanenet_fence.jpg)
20km of barriers, 31 underpasses and 1 bridge: getting ready for the great crab migration. – Christmas Island
![Harlequin crab (Lissocarcinus laevis) on sand beneath anemone, Great Barrier Reef, Queensland, Cairns, Pacific Ocean, Australia Stock Photo - Alamy Harlequin crab (Lissocarcinus laevis) on sand beneath anemone, Great Barrier Reef, Queensland, Cairns, Pacific Ocean, Australia Stock Photo - Alamy](https://c8.alamy.com/comp/G2MW2Y/harlequin-crab-lissocarcinus-laevis-on-sand-beneath-anemone-great-G2MW2Y.jpg)
Harlequin crab (Lissocarcinus laevis) on sand beneath anemone, Great Barrier Reef, Queensland, Cairns, Pacific Ocean, Australia Stock Photo - Alamy
![Studying marine crab genetic diversity in the Atlantic and Mediterranean ocean barriers - Universitat de Barcelona Studying marine crab genetic diversity in the Atlantic and Mediterranean ocean barriers - Universitat de Barcelona](https://www.ub.edu/web/ub/galeries/imatges/noticies/2016/09/cranc1.jpg)
Studying marine crab genetic diversity in the Atlantic and Mediterranean ocean barriers - Universitat de Barcelona
![blue swimmer crab on old chart the great barrier reef - Limited Edition 1 of 200 Printmaking by David Wardman | Saatchi Art blue swimmer crab on old chart the great barrier reef - Limited Edition 1 of 200 Printmaking by David Wardman | Saatchi Art](https://images.saatchiart.com/saatchi/1104595/art/4884681/3954509-HSC00002-7.jpg)
blue swimmer crab on old chart the great barrier reef - Limited Edition 1 of 200 Printmaking by David Wardman | Saatchi Art
![In preparation for the annual spawning season of the Red crab, rangers on Christmas Island put up barriers along the roadside to prevent the crabs from being crushed by cars. They have In preparation for the annual spawning season of the Red crab, rangers on Christmas Island put up barriers along the roadside to prevent the crabs from being crushed by cars. They have](https://i.pinimg.com/originals/5f/da/7b/5fda7b5243f59b6cccb14a3655a8679e.jpg)
In preparation for the annual spawning season of the Red crab, rangers on Christmas Island put up barriers along the roadside to prevent the crabs from being crushed by cars. They have
![Christmas Island on Twitter: "Christmas Island's red crab migration is officially underway! https://t.co/7qObidZnxh" / Twitter Christmas Island on Twitter: "Christmas Island's red crab migration is officially underway! https://t.co/7qObidZnxh" / Twitter](https://pbs.twimg.com/ext_tw_video_thumb/1061588859182403584/pu/img/tq_y50dwBI1i9zRS.jpg)
Christmas Island on Twitter: "Christmas Island's red crab migration is officially underway! https://t.co/7qObidZnxh" / Twitter
![Northeast Coastal and Barrier Network Species Spotlight: Atlantic Horseshoe Crab (U.S. National Park Service) Northeast Coastal and Barrier Network Species Spotlight: Atlantic Horseshoe Crab (U.S. National Park Service)](https://www.nps.gov/articles/images/IMG_20180822_085017-2-Copy.jpg?maxwidth=650&autorotate=false)
Northeast Coastal and Barrier Network Species Spotlight: Atlantic Horseshoe Crab (U.S. National Park Service)
![Stock photo of Hermit crab hunting on beach at night. Great Barrier Reef, Queensland.... Available for sale on www.naturepl.com Stock photo of Hermit crab hunting on beach at night. Great Barrier Reef, Queensland.... Available for sale on www.naturepl.com](https://www.naturepl.com/cache/pcache2/01036711.jpg)