When the first heavy rains of the rainy season come, about 40 million red crabs on this island migrate to the sea to mate. The journey from the highlands and rain forests to the Indian Ocean is about 9 km long. They often begin their migration in the early morning and late afternoon to avoid direct sunlight, but rains and wet overcast conditions also make the long journey more difficult.

During the peak of the migration, to protect this red crustacean, the government banned vehicles for a short time and built fences and tunnels to help the crabs navigate properly. way.

When reaching the shore, the male crab will dig a burrow and mark the shelter. Then about 5 to 7 days later, the female crabs will arrive and they will begin to mate. Female crabs often choose early morning when the tide is high to lay eggs. According to researchers, females always wait until the end of the month, when there is least change in sea level between high and low tides, to begin migrating, in order to increase the eggs’ chances of survival.

This year, the breeding day may fall on November 28 or December 28, so migration will begin 7 to 18 days earlier depending on the weather situation.