Origin of the species: where did Darwin’s finches come from? – the guardian.com

Galápagos finches have been the subject of a plethora of evolutionary studies, but where did the first ones come from?

Four of the species of finch observed by Darwin on the Galápagos Islands, showing variation of beak.
Four of the species of finch observed by Darwin on the Galápagos Islands, showing variation of beak. Photograph: Ann Ronan Pictures/Print Collector/Getty Images

When the first of the Galápagos Islands arose from the ocean floor around 3m years ago, they were naked, angry, lava-spewing cones devoid of life. Now, millions of years later, they are alive with some of the world’s most iconic animals. Giant tortoises. Sea iguanas. Flightless cormorants. And those finches equipped with Swiss army knife beaks.

The Galápagos finches are probably one of the most well-known examples of evolution and will forever be tightly linked to Charles Darwin’s voyage and his theory of natural selection (although you may be surprised to learn that the Galápagos finches were not as central to Darwin’s theory as we like to think). With their diversity of bill sizes and shapes, each species has adapted to a specific type of food; the ground-finch (Geospiza) has a thick beak adapted to feeding on a variety of crunchy seeds and arthropods, whereas the warbler finch (Certhidea olivacea) developed a slender, pointy bill to catch tasty insects hiding between the foliage. The woodpecker finch(Camarhynchus pallidus) even uses twigs or cactus spines to pry arthropods out of treeholes

Read the full article here.
The Farmer's Blogger

A little dose of love from my barn to your browser

aussiebirder

Welcome to our website for the study and appreciation of Australian birds and their interesting behaviours.

89.9 KRPS Public Radio News Blog

Daily news and features covering Southwest Missouri

Natural Moments

Nature photography, birds, butterflies and travel

Bird Watching Curaçao

All about the birds, bird identification & bird watching trips in Curaçao!

Northants birds

Bird news and more

Elizabeth River Bird Blog

Personal notes and thoughts on birds, bird photography, and on occasion, human life