Find out the number of circles in the given picture having Illusion

In the four images below, can you find the odd one out?

Spot 5 differences in two Christmas tree below:

Which tank will fill first?

Can you Find and name the hidden bird in the picture below ?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

Find the number of squares in the below picture

Spot what is wrong here in below Picture?

Find the hidden tiger in the given optical illusion ?