The one or more additional sensors are for sensing, for example, a piece of {TAIL ~ environmental information} in the immediate vicinity of {HEAD ~ the hydration sensor} 
The one or more additional sensors are for sensing , for example , a piece of { TAIL ~ environmental information } in the immediate vicinity of { HEAD ~ the hydration sensor }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD