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AnimalsThis invasive tick can clone itself and suck livestock dry
The newly invasive longhorned tick, now found in four continental U.S. states, spreads human diseases in its native Asia. Here, it’s mostly a threat to livestock — so far.
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LifeLeprosy lurks in armadillos in Brazil’s Amazon
Armadillos in the Brazilian Amazon are often infected with leprosy, which they may pass to people.
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EarthEarth’s rivers cover 44 percent more land than we thought
A global survey of rivers and streams based on satellite data suggests that these waterways traverse about 773,000 square kilometers.
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AnimalsWhy some mammal species don’t have descended testicles, but most do
New research studying genetic vestiges suggests that descended testicles are as ancient as the first placental mammal.