Birds take tRNA efficiency to new heights

Birds have been shaped by evolution in many ways that have made them distinct from their vertebrate cousins. Over millions of years of evolution, our feathered friends have taken to the skies, accompanied by unique changes ...

The epigenetics of life at 12,000 feet

Humans inhabit an incredible range of environments across the globe, from arid deserts to frozen tundra, tropical rainforests, and some of the highest peaks on Earth. Indigenous populations that have lived in these extreme ...

A search for new species on the high seas

Out of the vast number of life forms on the planet, it is estimated that fewer than 25% have been characterized, perhaps even fewer than 0.01%. Among this list, microscopic organisms are especially poorly represented: While ...

When determining sex, exceptions are the rule

For nearly a century, biologists have modeled the evolution of sex chromosomes—the genetic instructions that primarily determine whether an individual will develop into a male or female (or a certain mating type)—resulting ...

Sex as stress management in microbes

Why is sex so popular? The question of why so many organisms reproduce sexually has mystified evolutionary biologists since before Darwin, who wrote, "The whole subject is as yet hidden in darkness." In a recent article in ...

Warning signs in a poisonous Papuan songbird

Bright colors and conspicuous markings are often used in nature to warn off would-be predators. While we are used to seeing such markings—termed aposematic signals—in plants, caterpillars and snakes, we do not usually ...

Lessons on parasitism from the curious Dicyemida

The incredible diversity of life forms on the planet led Charles Darwin to note, "From so simple a beginning, endless forms most beautiful and most wonderful have been, and are being, evolved." In order to gain a true understanding ...

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