Armor Class 15 (natural armor)
Hit Points 248 (16d20 + 80)
Speed 20 ft., fly 120 ft.
Saving Throws DEX +4, CON +9, WIS +4, CHA +3
Skills Perception +4
Senses passive Perception 14
Languages —
Challenge 11
Keen Sight. The roc has advantage on Wisdom (Perception) checks that rely on sight.
Multiattack. The roc makes two attacks: one with its beak and one with its talons.
Beak. Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 27 (4d8 + 9) piercing damage.
Talons. Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 23 (4d6 + 9) slashing damage, and the target is grappled (escape DC 19). Until this grapple ends, the target is restrained, and the roc can't use its talons on another target.
Monster Manual (2014), p. 260