It typically takes up to three generations of butterflies to make the complete journey. This means that the navigation information is genetically programmed.
The ability to smell is one of the most complex of our senses. It requires sorting, analyzing, and sifting a torrent of input data quickly.
True arthropods are among the most sophisticated animals that appeared without ancestors in the Cambrian explosion.
What amazes me is how the female butterflies can smell dill over great distances, and so deposit their eggs on the right plants.