The Bhitarkanika National Park in Kendrapada district was reopened for tourists on Monday after a 10-day ban from January 8 for the annual census of birds and crocodiles.
While the headcount of the migratory birds was completed on January 10, the counting of saltwater crocodiles ended on January 17.
The footfall of migratory birds has declined compared to last year whereas the number of crocodiles has shot up, sources said.
During the last annual crocodile census, at least 1,645 crocodiles were reportedly sighted by officials at the creeks, rivulets and water bodies of the Bhitarkanika river system.
The Park, spread over 672 sqkm, has been designated as a National Park since 1998.