I forgot to mention they are nocturnal, while the larvae in the water can easy be picked by frogs and birds the adult ones hide in the mud on the ground if any danger occurs. on land they are well hidden during the day. I am not sure if rats, weasels and ferrets actually eat them, in Europe these are not the predators of these newts. Trouts, Ringelnatter (Natrix natrix), Wasserspitzmaus (Neomys fodiens) and some birds are the natural predators (and all the cars who run them over in spring time when they swarm and cross the roads on the way to the water holes and ponds.)
if DOC does a good job they got rid of these rodents anyway.