Charles Darwin marine iguanas | Charles Darwin's Theory of Evolution by natural selection

Charles Darwin marine iguanas

Darwin’s Imps of Darkness: The Remarkable Marine Iguanas of the Galapagos

Marine IguanaOf all the beauty Darwin encountered in the Galapagos, there was one animal for which he felt nothing but revulsion: the marine iguana.

Of all the profound beauty Charles Darwin encountered while studying exotic species and formulating his theory of evolution in the Galapagos Islands, there was one animal for which he felt nothing but revulsion: the marine iguana.

Ugly, black, clumsy and hostile, Darwin observed the world’s only sea-dwelling lizards sunbathing on the rocky shoreline for hours, often attacking one another while constantly expelling excess sea salt from their nostrils.

“The black Lava rocks on the beach are frequented by large (2-3 ft), disgusting clumsy Lizards. They are as black as the porous rocks over which they crawl and seek their prey from the Sea. I call them ‘imps of darkness’, ” Darwin wrote in his Beagle Diary.Marine Iguanas of evolution in the iguanas. “They assuredly well become the land they inhabit.”

Darwin took note of the unusual feeding behavior of the iguanas, which involves submerging themselves for up to 30 minutes in the cold Pacific waters at a depth of 10 m to forage for large amounts of sea algae growing on rocks near the shore.

After this exertion, the endothermic iguanas — who rely on external sources to regulate body temperature — lounge on the dark, insulating lava rocks to regain energy and stabilize their biological processes.

The iguanas’ bizarre and frequent “sneezing” is an evolutionary function designed to protect the animals’ kidneys from the accumulation of salt in their systems, due to the time spent swimming in the shallow sea.

While Darwin may not have considered the creature one of nature’s greatest aesthetic masterpieces, the beauty of this animal is in its perfect adaptation to its environment — one of the cornerstones of Darwin’s theory — and has therefore become one of the evolutionary icons of the Galapagos.

Marine Iguanas Marine Iguana Iguana on rocks Marine Iguana



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by intergenerations13

Here:
"""""""The truth, of course, is that the only necessary and sufficient condition for human beings to murder one another is the simple fact of being human. We've always been a lustily fratricidal species, one that needed no Charles Darwin to goad us into millenniums of self-slaughter. """"""
Do you believe this?
♥ marie

Good news! Humans are "naturally nice."

by MeanPeopleSuck

"Biological research is increasingly debunking the view of humanity as competitive, aggressive and brutish.
"Humans have a lot of pro-social tendencies," Frans de Waal, a biologist at Emory University in Atlanta, told the annual meeting of the American Association for the Advancement of Science on Monday.
New research on higher animals from primates and elephants to mice shows there is a biological basis for behavior such as co-operation, said de Waal, author of The Age of Empathy: Nature's Lessons for a Kinder Society.
Until just 12 years ago, the common view among scientists was that humans were "nasty" at the core but had developed a veneer of morality - albeit a thin one, de Waal told scientists and journalists from some 50 countries at the conference in...

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FAQ

sear_squid
Bio question on Charles Darwin?

How did he gather evidence for his theory?

Give two examples of his evidence.

I cannot find these in my bio text.

First thing, he was intelligent and possessed one of the traits a good biologist must have, the ability to be observant of all things.

Besides his extensive collection of specimens and notes, he also spent a great deal of time communicating with his peers. There were several other well know naturalist of his time that shared his thoughts.

avasutton
What animals did charled darwin study?

Charles Darwin studied many mammals including Reptiles, birds, pengiuns, giant tortoises, fur seals, sea lions, marine iguanas, kangeroos, rabbits, many insects and plants (although they are not animals, they are still important in Darwin's studies). While observing these creatures, Darwin concluded the following theories:
1. Common descent
2. Natural Selection
3. Evolution

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