why baby boys like cars?

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i have a 4 year old kid,he always insist for cars.i do'nt know how much he loves cars as atoy even real one,always demanding keep saying this car is better.i just fed up no other toy only cars,even he break all it's parts in one or two days.in whole house,wheel,body,battery of car.should i bought for him car after every two three days?is your kid is also fond of particular toy