In the Taijiang National Park in southern Taiwan, a simple yet surprisingly effective solution has been found to protect migrating land crabs. Small bamboo bridges have appeared on their path to the sea, and some sections of roads are temporarily closed to vehicles during the breeding season.
Every year from July to September, female mangrove land crabs leave the coastal forests and head to the sea to release their spawn into the water. However, the animals' natural route crosses roads, so previously many crabs died under car tires before reaching the shore.
To make the crossing safer, park staff and volunteers have begun building small bamboo bridges over the dangerous sections. These structures help crabs overcome obstacles and guide them towards the sea. On the most critical migration days, traffic on some roads is restricted, and volunteers patrol the area, monitor the animals' routes, and assist them in crossing to the other side if necessary.
The results have been impressive. While previously just over five thousand crabs were recorded during annual observations, in 2025 their numbers exceeded ten thousand. At the same time, the number of animals dying on the roads has noticeably decreased. The management of the national park attributes the population recovery precisely to the temporary road closures, the work of volunteers, and the bamboo crossings.
The protection of crabs is important not only for the animals themselves. Mangrove land crabs play a significant role in the life of coastal forests: they process organic debris and return nutrients to the soil. This helps vegetation grow thicker and makes the entire coastal ecosystem more resilient. As park director Chen Chun-shan notes, by protecting the crabs, people simultaneously help preserve the entire coastal forest belt.
Taijiang National Park is known for its mangrove swamps, wetlands, and a rich diversity of coastal animals. Rare black-faced spoonbills are also protected here – birds whose population was once on the brink of extinction but has gradually begun to recover.
The story of Taiwan's crabs shows that significant changes do not always require complex technologies and huge budgets. Sometimes, a few bamboo bridges, a temporarily closed road, and people willing to help small travelers safely reach the sea are enough.
