Braised crabs at Xie Lao Song. [Photo provided to China Daily]

Xie Lao Song, or Old Song's Crabs, is holding its annual crab festival at its four outlets in Beijing until Oct 22, with prizes for its customers.

The restaurant franchise, which originated in Hubei province, is famous for its spicy crabs.

At the entrance of its restaurants, a giant fish tank showcases about 18 species of crabs from all over the world.

During the festival, customers get a discount for popular dishes, and they can also win coupons by sharing the event on their WeChat, a popular social messaging app.