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Why Some of Darwin's Finches Evolved to Become Vampire Finches


Why Some of Darwin s Finches Evolved to Become Vampire Finches
KIYOKO GOTANDA, ET AL., THE CONVERSATION
16 JANUARY 2021
For most people, the word vampire brings to mind Dracula or perhaps slayers such as Blade or Buffy; or maybe even the vampire bats of South America. Few will think of a small and rather lovely bird – the finch.
 
But there are indeed vampire finches that feast on the blood of much larger birds, and they were introduced to the world in a fantastic segment of
Perfect Planet, the new series narrated by David Attenborough for the BBC. For us, these finches needed no introduction as we have studied them closely. ....

United States , Charles Darwin , Jaimea Chaves , David Attenborough , Perfect Planet , Amp Quot , ஒன்றுபட்டது மாநிலங்களில் , சார்லஸ் டார்வின் , டேவிட் அட்டன்பரோ , சரியானது கிரகம் ,

Which Came First: Sleep or The Brain? Scientists Think They've Found The Answer


12 JANUARY 2021
It s not a question you might have thought about, but which came first: sleep or the brain? To put it another way, can organisms without brains go to sleep? Based on a study of primitive, water-dwelling life forms called
Hydra vulgaris, scientists might finally have the answer.
 
New research shows how these tiny creatures can enter a sleep-like state despite not having brains – and that could teach us a lot about how animals evolved the need and capacity for sleep.
What s more, the team behind the study found that the chemicals that bring on drowsiness in human beings had the same sort of effects on ....

Taichi Itoh , Kyushu University , Amp Quot , கையஶு பல்கலைக்கழகம் ,