I know we have one beak in the game already, so why not go all out? These traits are found in the Savannah and jungle biomes on various wild creatures, where one would reasonably encounter predatory birds in real life
Avian Predator Beak: An eagle-like hooked beak takes place of the normal head slot. +2 Attack, -1 Smell. The color of this bill is dependent of the color of the horns the creature would have
Avian Song Beak: A toucan-like, very long beak that's perfect for scavenging. +1 attack, +2 Collecting, +2 Cracking, and the Bearyena-inspired trait similar to Big Voice. This trait is called "Shrill screech", and would scare off prey like Dodomingoes and Rabbits. Horn color also dictates the color of this bill!
Avian Body: A feathery body that's good for insulating against the cold. In the heat, the body molts to stave off overheating for one day. +2 Cold Resistance, +1 Heat Resistance if molted, distasteful appearance (Who wants a mouthful of feathers, anyway?)
Avian Stilt Legs: Thin, long hind legs that allow creatures to move well through unexplored grass and wade through water. +3 Speed, +1 Swimming
Avian Predator Claws: Owl-like claws with curled talons. -1 Movement, +3 Attack, +3 Fishing. These would take up the Paw slots on Nichlings, of course
