Six rhinos were dislocated from the Chitwan National Park (CNP), the largest rhino conservation centre of park of Nepal, in mid-August.
Of the six rhinos, one was found dead and five had crossed the border, according to the officials.
Four rhinos, including two adult females and one female calf, were rescued from Balmiki Tiger Reserve in Bihar coordination with Indian authorities, said an official at National Trust for Nature Conservation (NTC).
"We have spotted one more rhino in the Indian side of the border and efforts are on to bring it back to Nepal," said Chiranjibi Pokharel, project manager NTNC.
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A special operation was launched by the NTNC and CNP in collaboration with local conservation partners of India to bring back the dislocated rhinos from the forest area across the Nepal-India border.
A one-and-a-half-year-old male calf was brought back to Chitawan today. Earlier, three female rhinos, including a female calf, were rescued and brought back from Balmiki.