The fauna attraction of the Galapagos is, in addition to endemism by its isolation, due to the variety of species in different climatic zones gathered together in one place.
This is how we can find penguins along with reptiles of desert climates, or swimming with tropical fishes. Galapagos is also a place where we can see the same species distributed in different subspecies, one for each island, as it is the case of the giant tortoises that are the icon and that give the name to the archipelago. Darwin's finches and mockingbirds are also representative of Galapagos wildlife evolution. All these and other animals developed, over thousands of years, different strategies and specific adaptations to be able to feed on each island, presenting different signs of evolution over time. This phenomenon eventually led Charles Darwin to develop his theory of evolution.
Being Galapagos a group of volcanic islands of different ages, we find in them examples of different stages of what will have been the formation of the planet. We can observe how pioneering plants of fragile appearance open transition to life in the midst of fields of black lava, which seems at first sight impossible that something there could survive. In this sense, Galapagos is considered to be a living laboratory, where its attractiveness is not simply watch their peaceful animals at very short distances, but also observe, learn and understand how life developed on the planet, from its beginnings to what it is today.
It is the planet's largest living tortoise; they may weigh up to 230 Kg and live up to 200 years. They received from the Spaniards the name of Galapago for its resemblance to an English saddle. Darwin observed the differences in the shape of their shells, caused mainly by its scope to food availability or its reproductive behavior in each island. The subspecies from Isabela have been kept isolated from each other by the impossibility to pass through lava flows.
Tortoise from Santa Cruz | Geochelone porteri |
Tortoise from Santiago | Geochelone darwin |
Tortoise from Pinzon | Geochelone ephippium |
Tortoise from San Cristobal | Geochelone chatamensis |
Tortoise from EspaƱola | Geochelone hoodensis |
Tortoise from Pinta | Geochelone abingdoni (Solitary George - extinct June 2012) |
Tortoises from Isabela: |
|
Tortoise from Alcedo | Geochelone vandenburgi |
Tortoise from Cerro Azul | Geochelone vicina |
Tortoise from Sierra Negra | Geochelone guntheri |
Tortoise from Darwin | Geochelone microphyes |
Tortoise from Wolf | Geochelone beck |
On each island all species present a different morphology of its beak, also derived from the food found on the Islands they inhabit, or expertise in their respective eating habits. From a single common ancestor, the following species have been developed in the Galapagos:
Large ground finch | Geospiza magnirostris |
Medium ground finch | Geospiza fortis |
Small ground finch | Geospiza fuliginosa |
Common cactus finch | Geospiza scandens |
Large cactus finch | Geospiza conirostris |
Sharp-beaked ground finch | Geospiza difficilis |
Vampire finch | Geospiza difficilis septentrionalis |
Vegetarian finch | Camarhynchus crassirostris |
Large tree finch | Camarhynchus psittacula |
Medium tree finch | Camarhynchus pauper |
Small tree finch | Camarhynchus parvulus |
Woodpecker finch | Camarhynchus pallidus |
Mangrove finch | Camarhynchus heliobates |
Warbler finch | Certhidea olivacea |
Having no predators and without the need to move long distances to find their food or for reproductive requirements this nice bird gradually lost its ability to fly. Its wings were atrophy, losing most of their feathers.
In all these and in every native and endemic species of the archipelago we can find different examples of adaptation, and all this we see when we travel between the different islands, doing some attractive hiking and attentive observation.
Underwater we also find many wonders, as well as the fact that, by the influence of ocean currents, the Equatorial location and climate, the Galapagos Islands have special conditions which are not repeated on any part of the world and gather a variety and huge amount of exceptional marine fauna and flora.