Thursday, February 21, 2013

NOW YOU KNOW

Dung beetle
Dung beetle (Photo credit: Wikipedia)
Scientists have long known that birds and seals navigate by the stars. Now they’ve discovered that even the lowly dung beetle uses the Milky Way as a compass. “This is a complicated navigational feat—it’s quite impressive for an animal that size,” biologist Eric Warrant of the University of Lund, in Sweden, tells NationalGeographic.com. Males among the inch-long beetles compete for mates by finding animal dung, sculpting a portion of it into a ball, and quickly rolling it away from the heap before another beetle can steal it. The dung ball then serves as food and as an incubator in which a female he has courted will lay a single egg. Researchers noticed that the beetles appeared adept at navigating away from a dung pile under clear skies, but on overcast nights they rolled in circles. So researchers took them to a planetarium. There, when the streak of the Milky Way was visible, the beetles’ path was direct and unerring. Warrant believes further research could establish stellar navigation as a widespread skill among insects. “Migrating moths might also be able to do it,” he says.
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