Red crabs live alone in dirt burrows, or deep rock crevices. Crabs stay in the shade of their dwelling for most of the year. In October or November, when the wet season is about to return, crabs begin their migration to the shore. This timing coincides with the lunar cycle and the tides.
How far do red crabs migrate?
The crabs generally walked in straight lines, and most crabs from around the Island traveled toward the northwest shore instead of simply walking toward the nearest shore. The maximum recorded distance walked by a red crab in one day was 1460 m, but the mean was 680 m per day in 1993 and 330 m in 1995.
What is the type of migration of a red crab?
The red crab breeding migration comprises a series of separate actions on the crabs’ part that follow on from one to the other in a programmed sequence. These separate actions in combination make up the breeding migration and one action will not occur unless the preceding action is accomplished.
Are the red crabs of Christmas Island edible?
The Christmas Island red crab, Gecarcoidea natalis, is a species of terrestrial crab endemic to Christmas Island in the Indian Ocean. Red crabs aren’t the kind of crabs you get at a seafood restaurant. Their meat are made up of 96% water and they are just too small and don’t have good flavor to be considered edible.
How do crabs know where to go?
More puzzling: how animals measure distances. A new study has found the first direct evidence that fiddler crabs monitor their travels by tracking their strides. The obvious explanation for how fiddler crabs chart their path home is that they simply count their steps heading away from their burrow.