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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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ScienceShot: A Fly's Imperfect Disguise
21 March 2012 2:01 pm
The fly on the left is a puzzle. In theory, it should have evolved to look just as wasplike as the one on the right, the better to ward off hungry birds. But many members of the family Syrphidae, to which both flies belong, only vaguely resemble stinging insects. Scientists have suggested that these mimics are imprecise because they simultaneously copy multiple species, or that humans see imperfections invisible to birds. To test these and other explanations, researchers examined 38 species of hover flies (Syrphidae) and 10 species of bees and wasps. After a statistical analysis of the insects' body measurements and colors, as well as their abundance and ability to trick both humans and birds, the authors discarded most of the existing explanations. Instead, they report online today in Nature, the answer comes down to size: Big flies were the best mimics and small, housefly-sized ones the worst. The team suggests that, because birds prefer to eat larger flies, the little ones simply aren't under as much pressure to evolve perfect disguises.
See more ScienceShots.