3 ms·

Another possibility: being fed on by blood-sucking parasites makes birds crave the taste/smell of cigarettes, without any understanding of the insecticidal prop

• azernik 9y ago
  Evolution does not require understanding on the part of the creature that is evolving.
  • mitchty 9y ago
    Indeed, I doubt any gecko understands the Van der Vaals forces that enable them to stick to walls, but they use it all the same.