A livestock ear tag system is disclosed herein. An example tag includes a flexible substrate having a first end and a second end, a solar panel coupled to the first end on a first surface, a rigid housing associated with the second end, an electronics assembly associated with the rigid housing, a sensor housing that extends from the rigid plate, the sensor housing comprising two pin receivers that extend in opposing directions relative to one another, the two pin receivers each adapted to receive a pin that secures the device to an ear of an animal.