 As the blue iguana consumes a variety of plant material , favoring fruits and flowers over leaves and stems when available , it is valuable on Grand Cayman as a seed disperser throughout its range . A study in 2000 by Dr Allison Alberts revealed that seeds passing through the digestive tracts of Cycluras germinate more rapidly than those that do not . These seeds in the fruits consumed by the blue iguana have an adaptive advantage by sprouting before the end of very short rainy seasons . The blue iguana is an important means of distributing seeds to new areas and , as the largest native herbivore of Grand Cayman 's ecosystems , it is essential for maintaining the delicate balance between climate and vegetation necessary to survive under harsh conditions . 
