some birds have very small blind spot

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yes, you read that right. Rabbits, parrots, and chameleons can look at their back without rotating their head. 
This is because they have their eyes placed on side of their head through which they have a very viewing field i.e. near about 360 degrees.
they can even move their eyes independently by 360 degrees to keep their eyes on predictors. But as they have such a wide view they can't focus properly and can see thus they rotate their eyes continuously.

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