Why does the pure blood again mix with impure blood in birds when it comes from lungs

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Solution

Amphibian/Reptilian heart: It is a three chambered heart which includes two atria and one ventricle. Here both oxygenated and deoxygenated blood gets mixed up with each other. Double circulation is seen in the organisms possessing this type of heart. Lungs are involved in purifying the blood.
Avian heart: Bird’s heart is a four chambered heart and complex in its evolution. It pumps more blood than mammalian heart as birds require lot of energy to fly high in the air

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