Tag: evolution
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Alone. Evolving. Crying…
North America's beloved Monarch butterflies are known for their annual, multi-generation migrations in which individual insects can fly for thousands of miles. But Monarchs have also settled in some locations where their favorite food plants grow year round, so they no longer need to migrate. A new study of specimens collected over the last two…
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Cooperation. Because of… cooperation?!
In nature, organisms often support each other in order to gain an advantage. However, this kind of cooperation contradicts the theory of evolution proposed by Charles Darwin: Why would organisms invest valuable resources to help others? Instead, they should rather use them for themselves, in order to win the evolutionary competition with other species. A…
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Reverse evolution 2.
Turtle ant soldiers scuttle to and from sporting shiny, adorably oversized heads, which they use to block the entrances of their nests -- essentially acting as living doors. Not all heads are shaped alike: some soldiers have ones that resemble manhole covers and perfectly seal tunnel entrances. Others have square heads, which they assemble into…
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Why doesn’t any animal have three legs?
If 'Why?' is the first question in science, 'Why not?' must be a close second. Sometimes it's worth thinking about why something does not exist. Such as a truly three-legged animal. At least one researcher has been pondering the non-existence of tripeds. "Almost all animals are bilateral," he said. The code for having two sides…
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The evolution of… evolution.
New research identifies a previously overlooked global event which changed the course of the evolution of life in the oceans. It coincided with a rise in calcium carbonate-secreting plankton and their subsequent deposition on the ocean floor. The ocean as we understand it today was shaped by a global evolutionary regime shift around 170 million…
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