Something is missing

I haven’t seen him for weeks now. The first time we met him, he lectured about wildlife in the bog.
He is always accompanied by female assistants. They carry all sorts of stuff for him: Buckets, magnifying glass, nets and fishing gear.

But people around him are having a very hard time keeping up with his enthusiastic research of animals, fish and insects.
He runs across the tree roots so fast that his feet barely touch the ground.
Where others would fall, he soars like a cloud drifting in the sky.

Often, he lies on his stomach and watch the colourful dragonflies acting with blinding speed across the lake.

The last time we saw him, he was really excited. He hovered towards us in his usual way.
Gently he handed an object forward with both hands. It was a large skin from a snake not easy to find.
Be very careful, it breaks easily, he said.
Seconds later he was gone.

Soon after we could hear him talking with his assistant.
I have met many people throughout my life, but rarely a 4-year-old little boy who impresses so much with his being.

His name is Sebastian.