Perhaps not completely bonkers
Measuring river flow could perhaps be useful given the number of hydro-schemes potentially in the offing in North Wales as well as provide early warning of flooding.
I can just imagine a group of walkers chasing after a bunch of sheep to improve their mobile wireless connection through a PAYG mesh network or something. Even so, I wonder if there are that many sheep out there to make one viable. But agreed the margins on sheep are so horrifically poor, the farmers would basically have to be paid to put the devices on the fluffy critters.
Landline based broadband is improving quite a lot in North Wales. My village not too far from Conwy now gets a reliable 36Mb/s. Mobile, however, is still an absolute shocker even immediately outside of medium sized towns.