Evolution

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Marjorie Sorensen with birds in Zambia

WHY SING IN WINTER  Marjorie Sorensen, tracking bird movements in a seasonally flooded valley in Zambia (left), is studying why great reed warblers (one shown, right) overwintering there sing so much.

Pseudomonas aeruginosa

PLAYING DEFENSE  Random shifts in behavior could help disease-causing microbes like the bacterium Pseudomonas aeruginosa, pictured above, evolve antibiotic-resistance, a new study suggests. 

mice

MADE MALE  This male mouse (white) has no Y chromosome, but was able to father pups (brown) when scientists injected his immature sperm into eggs. Researchers made the mouse male by manipulating genes on other chromosomes. 

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