Assam registered the highest number of 167 tigers, an increase from 143 in 2010, while 28 tigers were estimated in Arunachal Pradesh, showing an increase over 14 in 2006, the report said.

The survey was not held in Arunachal Pradesh in 2010.
    
Besides Assam and Arunachal Pradesh, the other areas included in the status report are Mizoram and north Bengal.     

The region includes seven tiger reserves – Manas, Kaziranga and Nameri in Assam, Pakke and Namdapha in Arunachal Pradesh, Dampa in Mizoram and Buxa in West Bengal.     

Kaziranga National Park in Assam has the highest tiger population of 125, while the minimum number of four each were recorded in Namdapha National Park in Arunachal Pradesh, the report said.

Another report 'Connecting Tiger Populations for long term conservation', released simultaneously on January 20, said the population of big cats in the area have historical evolutionary significance as they share the connecting gene pool with south east Asian tiger population and represent the entry point of tigers into the Indian sub-continent.

The region has two Tiger Conservation Units (TCUs), one comprising Manas Tiger Reserve, stretching across Bhutan to Arunachal Pradesh in the north east while the other includes Kaziranga in Assam and stretches up to Meghalaya.

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