Guwahati/ Jorhat, May 10: The population of eastern swamp deer in Kaziranga tiol Park has registered an increase of 19 over last year, according to a week-long estimation that ended today. As per the latest count, there are 1,148 eastern swamp deer in the park - 284 adult males, 604 adult females, 84 yearlings and 176 fawns, DFO Subhashis Das said. The animal is spread over 20 blocks in the four ranges of the park - Eastern Range, Central Range, Western Range and Burapahar Range. GPS, binoculars and digital cameras were deployed to assist the enumerators for better observation. Besides the forest staff of Kaziranga tiol Park, representatives of Wildlife Trust of India, Corbett Foundation, local NGOs and mediapersons took part in the operation. Swamp deer is one of the park's rarer species. When it was discovered in 1991, it numbered 559 in the park. In 2007, the population increased to 681. Since then, its numbers have only increased. In 2013 and 2014, the numbers was 836 and 854 respectively.