What is this structure in this tree 🌲

[prameshtyagi]

Earliest correct answer will be upvoted

Comments

[papacrusher]

Is it a bird's nest?

[prameshtyagi]

Thnx. Let us see

[kepelle]

I think It's called a tree hole

[prameshtyagi]

Thnx. Let us see

[umairzeb]

Oops maybe my answer is wrong but you may know from my comment

[prameshtyagi]

Thnk u. But I don’t see answer in yr comment

[steemscribbler]

That is a tree hollow, basically its a cavity given by the nature to the tree.
The tree is a shagback hickory, the tree grows very slow and lasts very long.