March of the crabs explained.

The article discusses a study on the migration of the Christmas Island red crabs in Indian Ocean, conducted by researchers from the University of Bristol in England. The red land crab's migration occurs at the start of the wet season and is timed so female crabs can release their eggs into the sea. It states that the researchers measured the concentrations of crustacean hyperglycaemic hormone (CHH) in the eyestalk glands and blood of the crabs during the wet and dry seasons in order to find out whether the hormone played a role in their migration.