The snow owl can heal other Dinos with its frost attack

They can thermally detect any living thing around you giving a strong pvp advantage. Like a night vision with wings. Plus they can put you and your allies in stasis and heal you whilst being an ice cube. Decent airborne mount -

It divebombs like a griffin and heals like a daodon

Can walk backwards, unlike an argy. Mic drop

It's healing ability for you and those around you burns through stamina really quickly