But only the Forsaken have ever been allowed to tap into the TP, no ordinary 3rd Age channeler has done that according to Moggy so how can rats and ravens have been used as spies before the Forsaken were freed? Yet the Shadow's spies are an accepted part of the Borderland lore. Would the Dark One personally see to all the animals himself? That would mean that the animals would have to come to Shayol Ghul since the DO likely couldn't reach them anywhere else. But the animals wouldn't survive the Blight! So who weaves the TP?

Uno told Perrin that the animals have to report to Myrddraals, that the Myrddraal pulls the info out of them. I figured it's a Myrddraal skill, nothing to do with TP (well, everything to do with TP since it's Myrddraals, but not directly).