Barrington Land Iguana
The Barrington Land Iguana found only on Santa Fe Island in the Galapagos is similar in every detail to other Galapagos Land Iguanas, found on other islands, except that the Barrington Island Iguana is paler yellow in color with a longer more tapered snout and more pronounced dorsal spines. Its head jerks are also in the exact opposite direction and those found on other islands.
In the photo you see the trunks of a large variety of the prickly pear cactus (Opuntia echios), that almost resembles a tree.
Most prickly pears in Arizona, where I come from, sit low to the ground but because over the centuries rodents, like the Santa Fe Rice Rat (Aegialomys galapagoensis bauri) fed on these cactus, it has grown a hard trunk and high pears, to help protect itself.
Santa Fe Island, Galapagos