Every summer, the Asian house martins return to their roost sites to breed. The old nest deep in a rocky depression is the object of grand prix races every year. It provides shelter and repels predators with its tricky location. The perfect spot is already occupied by veterans. A newcomer is here and it needs to find a spot and rebuild the nest. What will it use to decorate the nest and make it solid at the same time? Check out the video to learn more!

About Journeys in Nature: Minshan Mountains Series

Minshan Mountains are a mountain range lying at the borders of China's Sichuan and Gansu provinces. Most of the mountains have steep walls and sharp peaks. In this series, CGTN Nature's filming crew went into the mountain range located in Sichuan, which is also part of the Giant Panda National Park in China. They traveled through the dense forest and crossed the rapids to capture the scene of stunning nature and fairy-like animals. Stay tuned!

For more:

Minshan Mountains Series Ep. 1: What is the survival rule here?

Minshan Mountains Series Ep. 2: A macaque trapped on a rock in rapids

Minshan Mountains Series Ep. 3: Better safe than sorry in the forest

(Cover image a video screenshot; video by the CGTN Nature film crew)

(If you have specific expertise and want to contribute, or if you have a topic of interest that you'd like to share with us, please email us at nature@cgtn.com.)