The term denotes a mass aggregation of crustaceans, typically red crabs (Gecarcinus lateralis or similar species), undertaking a large-scale migration. This phenomenon often involves vast numbers of individuals, potentially reaching into the millions, traversing considerable distances to reach breeding grounds. An illustrative example is the annual migration on Christmas Island, where a similar species undertakes such a journey to reach the ocean shores for spawning.
These remarkable events are ecologically significant, influencing nutrient cycling and impacting coastal food webs. Historically, such mass migrations have presented both opportunities and challenges to human populations, offering a seasonal food source while potentially disrupting infrastructure and local ecosystems. The spectacle itself is often of considerable scientific and public interest, drawing attention to the complexities of animal behavior and the interconnectedness of terrestrial and marine environments.
