Three main things must occur for the young salmon, called a smolt, to prepare for life in the salty ocean.
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.
Living things are on the move everywhere. Why do some of them go to great lengths to migrate, while others stay put?
One of the reasons cockroaches are so successful is their keen sense of smell.