Radagast the Brown??

[Faramir Jones]

You said here that:

Originally Posted by Inziladun

While the Company was in Eregion, the crebain from Fangorn were shadowing them, and you'd think, with Radagast's affinity for birds and beasties, that if he'd known of Saruman's treachery he would have put an end to their spying for him.

Radagast doesn't control all the birds and beasts. There's an indication of this, after he delivered Saruman's message to Gandalf. The latter asked him to 'Send out messages to all the beasts and birds that are your friends'. This implies that thre were birds and beasts who weren't under Radagast's control. Presumably, the crows you mentioned were among them.