The hidden cave where the tree live: when a zorro clan member enters in dragon form they glow real dragons also live here but are endangered species.

Credit to artists.
How they fly:

How they play: chasing each other, or roll in grass

How they firt:

Firting bit also a greeting ^

They have cat like behavior.

How they glow in the hidden cave:

The hidden cave:

The cave entrance: behind a waterfall on the nara island

The pathway

The entrance  from the sea

ONCE AGAIN CREDIT TO ARTISTS.