Seismologists in Nanjing, the capital of eastern Jiangsu province, have set up seven observation centres at zoos and animal parks in the region, the Modern Express website reports . They'll be watching for changes in behaviour among thousands of animals, which might be a sign of an imminent tremor. An ecological park in the city's Yuhuatai district has become one of the seismic monitoring sites, with 2,000 chickens, 200 pigs and 2 sq km (0.8 sq miles) of fish ponds, the report says. Cameras have been installed around the park, and staff will report back to the seismological bureau on the animals' behaviour twice a day.