Proboscis of a moth
Butterflies and moths have a very tight evolutionary relationship with the flowers on which they feed. They feed with a long, coiled, straw-like mouthpart called a proboscis. Because flowers come in all different shapes and sizes, butterflies and moths need to evolve mouthparts that can reach the nectar inside different flowers. In fact, Charles Drawin once examined a flower with a nectary hidden nearly 12 inches inside the plant and predicted a moth must exist with an equally long proboscis to feed on that flower. The existence of such a moth was discovered 40 years later.
Image by Dr. Igor Siwanowicz, HHMI Janelia Farm Research Campus.