[Answer] Why are the large finches now living on the Galápagos Islands different from the original source population from a nearby island?

Answer: All three answers are correct.
Why are the large finches now living on the Galápagos Islands different from the original source population from a nearby island?

The closest known relative of the Galápagos finches is the South American Tiaris obscurus. They were first collected by Charles Darwin on the Galápagos Islands during the second voyage of the Beagle. Apart from the Cocos finch which is from Cocos Island the others are found only on the Galápagos Islands .

One of the best-known is the Galápagos tortoise which lives on seven of the islands .It has an average lifespan of more than 150 years. The marine iguana is also extremely unusual since it is the only iguana adapted to life in the sea. Land iguanas lava lizards geckos and harmless snakes can also be found in the islands .The large number and range of birds is also of interest to scientists …

Galápagos wildlife – Wikipedia

Galápagos wildlife – Wikipedia

Isabela Island (Galápagos) – Wikipedia

The Galapagos hawk is similar in size to the red tailed hawk (Buteo jamaicensis) and the Swainson’s hawk (Buteo swainsoni) of North America but the size is variable across the islands as is recorded for many animals native to the Galapagos.They appear to be somewhat more heavily built than those well-known mainland species and going on average weights this species is the second heaviest …

Island gigantism or insular gigantism is a biological phenomenon in which the size of an animal species isolated on an island increases dramatically in comparison to its mainland relatives. Island gigantism is one aspect of the more general ” island effect” or “Foster’s rule” which posits that when mainland animals colonize islands small species tend to evolve larger bodies and large …

The marine iguana (Amblyrhynchus cristatus) also known as the sea iguana saltwater iguana or Galápagos marine iguana is a species of iguana found only on the Galápagos Islands ().Unique among modern lizards it is a mari…

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