Is this fox playing tricks on you? (Solution)

Illusion created by Culpeo. - Mighty Optical Illusions

Now can you see the fox's companion?

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In the following illusion, the shapes and colors give a startling
impression of movement, even though this is actually a still image!
The movement always seems to be occurring where your eyes aren't
focusing.

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(Images courtesy of Mighty Optical Illusions.)