Optical Illusions

There may well have been photoshop involved in some of these, but they are sure to make you look twice!
What do you see?

Peaceful

This one I've seen a few times, the original picture and the artists website can be found here!

It's not a frog!

A huge pipe?

Look again

When a herd of Zebra meets a beautiful Lion

In Hiding

A Howling Wolf

How many Wolves can you see?