A Wireless Sensor Networks (WSNs) exploits the sustainability technological requirement and research solution to alternate energy source of power. To power WSNs is by harvesting ambient energy from the environment is a promising challenge as there is no such efficient protocol that can continuously support the requirements. The authors provide a survey study of applying WSN to real application of habitat monitoring. A system architecture design of sensor nodes to address the requirement of habitat monitoring is analyzed. Consequently, substantial research efforts have been carried in designing sensor nodes that exploit sporadic energy needs to transmit data to maximize the lifetime of WSNs.