Optical illusion... Or See The Hidden! Fourth one...

Some of you commented saying they see nothing... Believe me, there is something to see... Let's continue with another one. Hint for this time: You should see an animal.

Place yourself 30 cm from the screen and control your eyes and focus to discover what is hidden in this picture...

What do you see? Answer in comments...

Don't be upset if you don't see it straight... it requires some training!