Plaza island is full of life. There are colonies of sea lions and land iguanas. On the steep banks it is possible to see a great number of birds such as nesting tropic birds and fork-tailed seagulls, but most of all, enjoying the beautiful view from atop the steep banks or strolling along the base of the cliff is an extremely pleasurable experience. The Opuntia cacti grow here too and the vegetation changes color according to the season of the year. South Plaza has a unique sesuvium and opuntia landscape which provides some of the most interesting wildlife observation available in the Galapagos. A large colony of noisy sea lions, numbering about 1,000 bulls, cows and pups, has its prime habitat on these smooth rocks. The small cactus forest is populated by land iguanas, which can be seen sunning themselves or feeding on opuntia pads and fruits. Swallow-tailed gulls, which nest on the rugged southern cliffs, are usually seen, along with tropicbirds and Audubon`s shearwaters.