The earliest known animal? — Why Evolution Is True

The Ediacaran fauna, a group of extinct species that lived between 571 and 541 million years ago, has been an evolutionary anomaly. Its fossil record contains multicellular organisms, but they are just plain weird, bearing little resemblance to present-day metazoan (multicellular) animals. The two species of “dickinsoniids” shown below, for example, lack a mouth or […]

via The earliest known animal? — Why Evolution Is True

September Issue is Out!

Sept announcement

Some of the highlights in our September Edition include:

  • Morty’s sage advice to Chiyome and flock
  • Zack and Bubbles try to help mom with her spatial challenges
  • The Trump Administration’s threat to weaken the Endangered Species Act
  • A new search-a-word
  • A collection of posts from around social media, including everyday heroes doing their part to save species, environments and habitats for future generations of wildlife and humans alike

Head on over to the blog to read these and many more interesting articles and posts!

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.