S'pose it might depend on the drone... if it were a military grade drone like the fire scout, they can hover at low altitudes and monitor almost any environment using a range of cameras including thermal, so technically they could spot the lynx, but unlikely they'd identify it... how could you preprogramme it to recognise a cat? Saying that, it can already recognise different military vehicles, so its not impossible?!
Saying that, the drones used over here by the police, fire service etc are nowhere near as sophisticated and the minute the lynx disappeared into the trees, it's doubtful the drone could follow. Plus the civilian drones tend to be manual control, so its relying on the controller to follow a cat... I have trouble following my cat round the garden on foot, let alone with something as complicated to control as a camera drone.
As I say, I think because the lynx was in relatively open ground and they knew pretty much where it was at all times, the drones haven't been used to locate it, but more to watch it from a distance... probably helped decide where to drop the traps.