Millions of red crabs migrate on Christmas Island every year


About 80 million red crabs migrate each time on around Oct-Nov on Christmas Island every year causing traffic jam, Australian people and wildlife conservation organization must to fence and ban the citizens and vehicles to travel through this area.

If there is an opportunity, you should visit millions of red crabs migrating on Christmas Island once, and now, let’s go with to update the information and pictures to prepare for the coming soon travel.

At the beginning of the year’s last quarter, a migration considered as the biggest one in nature on Christmas Island in Australia, about 80 million red crabs simultaneously migrate within nearly one week, pass approximate 10km to reproduce.

When the tide rises and the rainy season is coming, the red crabs start their migration; they come out from the millions of large and small burrows then come to the sea. When the exodus started, all traffic vehicles and daily activities of the local people stop to pave way for the red crabs.

At that time, the red crabs move with only one purpose of reproduction; they move to beach under the instinctively available routes, the male red crabs usually come first and leave the others about few days; when reach to the sea, they lie into water for a period to supplement the water lacked during moving time and get back the moisture.

After 1-2 days, they will transfer to the area with lower terrain to burrow and prepare for reproduction. Usually, female red crabs come later and mating process takes place in the burrow that the male red crabs hardly done or fought to gain from weaker red crabs.

After the matching process finished, the male red crabs come back to forest; they find caves, shelters and looking for food. In contrast, the female ones, after matching, will stay for about 2 week for laying and hatching; their eggs, after laying, will lie under the carapace and grow up day by day during hatching period.

In average, each female red crab lays 90.000-120.000 eggs; they usually come out form the forest at the late of the month, match, lay eggs and hatch eggs within 15 days. When the moon is full, the female red crabs move to beach and then transfer the egg being inside the carapace into water. The eggs will hatch into larva and gradually grow up in the next time period.

After passing the hatching and perfecting body, the red crab will has size of about 6mm; they move to beach and come to land for starting a new independent life cycle. Unfortunately, after hatching and moving to the land, the number of red crabs alive is just about 1/5 out of the total eggs.

Crabs like the cool place, so they usually stay in caves being out of sight and sunshine; their food is mainly leaves and rotten fruits; their grow speed is very slow but the maximum size of red crabs is 17cm in width, measured to leg’s tip.

The body of red crabs has a very special structure; they can move 1km every day because they have the ability to secrete a high sugar hormone; this kind of hormone provides more energy for them to move within a day.

According to preliminary estimates, the number of red crabs on the Christmas Island is about 200 million individuals, but their existence is threatened by human activities having significant influence to the natural environment and climate change problem. They prefer damp places and caves. However, due to deforestation, the red crabs usually die when migrating across the place without forest covering; in addition, a large part of red crabs are also killed by traffic vehicles when there is not sign board or security team.

However, the biggest and most dangerous threat for the red crabs is the invasion of the yellow ant species coming from Africa, this type of yellow ant is brought to this island by accident, according to investigation,perhaps there was aperson bring this species to here for breeding and experiment new habitat. The yellow ants often eat the death red crabs, but the limited number forces them to attack the red crabs by injecting poison into crabs’ body instead of waiting for them to die.

Because of the weather’s effect, the population of the yellow ants is increasing rapidly, and it is seem to the Christmas Island is no longer belong to red crabs; they are ceding the throne to the ants. Each year, about 30 million red crabs are killed in average; this number is increasing gradually because the number of yellow ants is rising without the sign of stop.

This is a good chance for you to visit the Island of these “red crabs” before they are disappeared; please spent a minute to rate 5 stars for each article and share it for people to know this ideal destination. Have nice and interesting trips.

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Millions of red crabs migrate on Christmas Island every year
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