Tolkien's Middle Earth contained a number of intelligent bird species, mostly those that had been exposed to high-level magic (or were Maia in disguise) rather than as a result of normal evolution.
Ravens
The intelligent ravens of Ravenhill near Erebor, could live to a great age and some could even speak Westron.
They are reputedly the messengers of the Vala Mandos
Hawks
Spirits in the shapes of hawks and eagles were the servants of Manwë Súlimo, continually flying over Middle-earth to gather information for their master. Above many flocks of crebain, Aragorn noticed hawks, flying high in the sky, during the War of the Ring.
