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27 November 2013 12:59 pm ,
Vol. 342 ,
The new head of the National Center for Science Education promises to "fight the good fight" against attacks on...
Analyses of the H7N9 strains isolated from four new cases show that the virus is evolving rapidly, heightening anxiety...
In 2009, Jack Szostak shared a Nobel Prize for his part in discovering the role of telomeres, the end bits of...
Science has exposed a thriving academic black market in China involving shady agencies, corrupt scientists, and...
Paper-selling agencies flourish in the aura of reputable businesses. For some scientists, it may be difficult to tell...
Data collected by satellites and floating probes have chronicled a 2-decade rise in the temperature and thickness of a...
Cholesterol, the artery-clogging molecule that contributes to cardiovascular disease, has another nasty trick up its...
Until recently, the Defense Advanced Research Projects Agency (DARPA) kept its plans for its $70 million portion of the...
- 27 November 2013 12:59 pm , Vol. 342 , #6162
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ScienceShot: Tool-Using Crows Eat Well
16 September 2010 2:00 pm
How hard do you work for your dinner? Depends on how good the food is, right? The same goes for New Caledonian crows. These clever birds are famous for fashioning spears and hooks out of twigs to reach beetle grubs holed up in rotting tree branches. But scientists didn't know why they went to so much trouble, when they could just use their beaks and talons to snag food elsewhere. It turns out tool use is a much more efficient way to hunt. Reporting online today in Science¸ researchers have found that just a few wood-boring longhorn beetle grubs satisfy the crow's energy requirements for the entire day. Compared to hunting and foraging for smaller, less nutritious insects, nuts and seeds, tool-use makes for a smart meal plan.
See more ScienceShots.