Complex sentence: It is the smallest of the three species of iguana found on Utila, and unique among Spiny-tailed iguanas as it is born a dark color as opposed to bright green or yellow.
Split into simpler sentences: It is the smallest of the three species of Iguana found on Utila. Unique among the other species of Spiny-tailed iguana as it is born a dark color as opposed to bright green or yellow.