Answer:
What weaves webs as they grow?
A hill full, a hole full; yet you cannot catch a bowl full. What is it?
You can only have it once you have given it.
Both old people and owls are said to be possessing this trait
A muttered rumble was heard from the pen, and I, in my walking stopped to look in. What was this I saw? A massive beast, hoofed, and jawed. With spikes upon its mighty brow, I watched as he struck the turf and prowled. And yet for all of his magnificence, he couldn't get out of that wooden fence.
I have two eyes in the front and a lot of eyes on my tail