Roc

Rocs are colossal avians, the size of mountains, who lair in high mountains and who wing over coast and sea, preying on whales, elephants, and dire animals, usually dropping the animal from a great height so that it splatters on the ground. They also menace ships in the region, and are fierce defenders of their nests and eggs (which, being immense, are often sought out as food sources).

Rocs are often followed by avian scavengers, such as eagles and buzzards, hoping to grab the choicest bits of a roc's prey as they splatter on the ground. Rocs themselves ignore these scavengers, though aren't above snapping up a few in their beaks if they get in the way.

Rocs are occasionally domesticated by storm giants and cloud giants, who train them as guardians and mounts. Rocs are majestic natural creatures, and quite rare, so their existence is of special interest to many druids.

Rocs prey mostly on large mammals, but are also fond of ankheg, purple worm, and harpy. Dwarves have a fairly adversarial relationship with rocs as well, considering them troublesome menaces -- most mountain dwarf communities crack roc eggs on sight, and disrupt the nests, while taking refuge from retribution underground.