Which is the correct shadow of the bird?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

Readers with the highest levels of visual skills can find three differences between the pictures of a cow on the farm in 14 seconds. Can you? Test your visual skills now!

The more of this there is, the less you see. What is it?

Which organisation is a specialized agency of the UN that deals with global health issues?

a) World Trade Organization (WTO)
b) World Health Organization (WHO)
c) International Monetary Fund (IMF)
d) United Nations Educational, Scientific and Cultural Organization (UNESCO)

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

I have a big mouth and I am also quite loud! I am NOT a gossip but I do get involved with everyone's dirty business.

I die but do not live. What am I?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?