Fly fishers, especially those that fish for trout, are inordinately attuned to matching the hatch and selectivity. At certain times trout can be very choosy or selective about what they eat, and this singular trait has been elevated to a level approaching a religious experience. Some have suggested that this ability to be selective is a mark of intelligence, giving the trout an ability to apply logic and reasoning when they are feeding. In reality we can be very thankful that nothing is further from the truth.