Flyby. The pteranodon doesn’t provoke an opportunity attack when it flies out of an enemy’s reach.

Limited Magic Immunity. The pteron can't be targeted by spells of 2rd level or lower unless it wishes to be. It has advantage on saving throws against all other spells and magical effects. However, spells with area's of affect can still be pointed in the pteron's direction. When in an area of affect, the pteron has advantage on the saving throw.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 25 (5d8 + 3) piercing damage.