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Last few decades many animals, birds, reptile and fish species were wiped out from the planet due to human activity. Many more species are likely to lose their existence because of lost their natural habitat, increased human land use and poaching. Rhino is one of them which can be found now only in few protected areas such as Assam, West Bengal etc. of India because of poaching. In this paper, we propose a model of wireless sensor network's application to protect the Rhino against poachers in Kaziranga National Park, Assam, India. In the model, we place the sensor nodes in the boundary region of the Rhino inhabited area to take necessary action upon detection of human movement. Then, we propose a routing algorithm for the model where a sensor node selects a next hop sensor node based on a fitness function. We also propose a linear programming formulation for the proposed algorithm. Finally, we simulate the proposed algorithm for varying number of sensor nodes and BSs and compare different results in terms of various performance metrics. [ABSTRACT FROM AUTHOR]