Quetzalcoatlus (CR 8)

Huge Animal
Alignment: Always neutral
Initiative: +1 (Dex); Senses: darkvision 60 ft., low-light vision, Listen +5, and Spot +18

AC: 17 (-2 size, +1 Dex, +8 natural), touch 9, flat-footed 16
Hit Dice: 10d8+50 (95 hp)
Fort +12, Ref +8, Will +6
Speed: 20 ft., fly 100 ft. (poor)
Space: 15 ft./10 ft.
Base Attack +7; Grapple +11
Attack: Bite +13 melee and 2 wings +8 melee
Full Attack: Bite +13 melee and 2 wings +8 melee
Damage: Bite 2d10+8, wing 2d6+4
Special Attacks/Actions: Swallow whole
Abilities: Str 26, Dex 13, Con 20, Int 2, Wis 17, Cha 11
Special Qualities:
Feats: Alertness; Flyby Attack; Snatch; Wingover
Skills: Listen +5 and Spot +18
Advancement: 11-20 HD (Huge); 21-30 HD (Gargantuan)
Climate/Terrain: Warm forests, hills, mountains
Organization: Solitary, pair, or covey (3-5)
Treasure/Possessions: None

Source: Monster Manual II

Swallow Whole (Ex): Quetzalcoatlus can swallow a snatched opponent that is at least two size categories smaller than itself by making a successful grapple check (grapple bonus +23). Once inside the dinosaur, the opponent takes 1d8+4 points of bludgeoning damage and 1d4 points of acid damage per round from its gizzard. A successful grapple check allows the swallowed creature to climb out of the gizzard and return to the beak, where another successful grapple check is needed to get free. Alternatively, a swallowed creature can try to cut its way out with either claws or a light piercing or slashing weapon. Dealing at least 15 points of damage to the gizzard (AC is) in this way creates an opening large enough to permit escape. Once a single swallowed creature exits, muscular action closes the hole; thus, another swallowed opponent must cut its own way out. A Huge quetzalcoatlus's gizzard can hold 1 Medium-size, 4 Small, 16 Tiny, or 64 Diminutive or smaller opponents.

Feats: A creature that is flung by quetzalcoatlus after being snatched travels 100 feet and takes 10d6 points of damage. If quetzalcoatlus is flying, the creature takes this damage or the appropriate falling damage, whichever is greater.

When hunting over water, it flies low and scoops fish and aquatic reptiles from just below the water's surface. It also attacks small land creatures when it can find them. Vulnerable to other predators while it is on the ground, quetzalcoatlus prefers to swoop down, snatch its prey in its jaws, and then struggle to regain altitude while swallowing its catch.