Nevermore

"Roc" (unofficial) is a species of Grimm and the only avian species seen to date. It is first encountered by Team RWBY during the Beacon Academy Initiation test and is featured in Episode 8. However, it is also seen briefly during the Opening, during the group shot of all species making up the Creatures of Grimm.

Appearance
The Roc is a very large avian closely resembling a condor or vulture. Like all Creatures of Grimm, it has glowing red eyes and a mask-like white bony structure overlaying the upper front of its head. The head-piece also includes a dorsal spine or fin, reminiscent of that on the heads of condors and some ancient Pterosaurs.

Abilities & Powers
In the clip from Episode 8 premiered at PAX 2013, the Roc is shown avoiding a hail of ranged fire directed it by Team RWBY at a range of several hundred yards. This is a significant difference from the condor, which it otherwise resembles, as the condor generally has poor aerial agility.

Trivia

 * The 'Roc' is a gigantic predatory bird from ancient Indian or Persian mythology.