Sensory systems in animals evolve to help them sense their surroundings for survival. Different species have unique sensory components like receptors and cells. Genes for sensory receptors can change in size, leading to a wide range of sensory abilities. By comparing sensory systems in various species, scientists have discovered new types of sensory receptors and strategies. These comparisons also show when sensory changes happen and how evolution plays a role in shaping sensory systems.