In this work, we present RatMote, a new wireless sensor node for subterranean animal habitat monitoring. RatMote has been developed for project RatPack, which aims at creating a new method for behavioral research on rats in their natural environment using wireless sensor nodes. Recent development in microcontroller architecture allowed us to design a sensor node which calculates up to 22 times more operations per mAh than the widely used TelosB node. This significant performance and efficiency increase allows us to perform computationally demanding algorithms inside the node, needed for vocalization analysis, localization, and mapping.