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Wireless Senor Network (WSN) is an advanced sensing network consist of mini-nodes having abilities of sensing, processing and wireless connectivity. Due to distinguish capabilities, it is highly demanding network for reliable monitoring and analysis of physical parameters over any geographical area. Designing of routing protocols faces many challenges due to limited resources of WSN nodes like short memory, limited energy and limited processing. This paper has a qualitative study on four multicast routing protocols with energy-efficiency perspective. MAODV (Multi-cast Ad-hoc On-demand Distance Vector) is a tree based routing protocol with loop free routing. TEEN (Threshold-sensitive Energy Efficient sensor Network protocol), SPEED and MMSPEED (Multi-path Multi SPEED) are cluster based routing protocols with individual effectiveness in different performance parameters. Finally a summary of these protocols is presented with a table of different performance parameters.