you could also look into SAR and SPEED as well with good QoS capabilities

Precisely the selection of your routing protocol depends on the application that r u using habitat monitoring for pre defined fixed location like a Park or specific area, or the undefined mobile location in wild, efficient selection of routing totally depends on ur application , u may use

1) Geocasting

Packet is sent to all or some nodes within specific geographic region

i.e. query sent to all sensors within geographic area of interest

2) GEAR protocol, Geographic and energy aware routing

3) GFPG: Geographic-Forwarding-Perimeter-Geocast uses greedy forwarding to propagate packet toward target region,uses a combination of geocast and perimeter routing

Pl. go through Radial Basis Function (RBF)

http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=6949349&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D6949349

also check ad hoc on-demand distance vector (AODV) associated clustering for grid based and ID based AODV for disc based connectivity algorithms

http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=6821371&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D6821371

these are two latest paper pl. go through it.

I agree with the previous answers, as Khizar Abbas suggests, it would strongly depend on the application. I would say that if the nodes are dynamic, AODV or any of its variants (with modified parameters, or using artificial intelligence) should be fine, but in case of a static network, any tree-based routing protocol will usually offer better performance. 

The selection of your routing protocol is highly depend on your application requirements. You must first understand  what are the requirements of your application and then you can select your protocol.  In habitat related applications, mobility is the biggest challenge. So your protocol should support mobility.   One example could be AODV.

I too agree with Muhsin Atto. First you need to be sure like what is your application?. Based on your application you can choose your routing protocol.

LEACH (Low energy adaptive clustering hierarchy) protocol is energy efficient. I am not sure if it qualifies specifically for habitat monitoring, but if you define all parameters of your system and then match it with different protocols you will find what you are looking for.