The grassy area between the north zone 2 and the north zone 3, is full of pteranodons, sense it is a wide area, it is a great spawning place for large quantities of Dino's, just be careful, there have been many sightings of raptors roaming around- good luck.
When you encounter this bird it is passive unless you take its egg. It's battle attacks are a spin attack and it does the most damage. The other one is a bite attack at it's not as effective. So when in battle do a spin attack to beat your foes.