New York: Cows can sense Earth s magnetic field, scientists say.

German scientists using satellite images posted online by the Google Earth software programme have observed something that has escaped the notice of farmers, herders and hunters -- Cattle grazing or at rest tend to orient their bodies in a north-south direction just like a compass needle, the Los Angeles Times reports.

Studying photographs of 8,510 cattle in 308 herds from around the world, zoologists Sabine Begall and Hynek Burda of the University of Duisburg-Essen and their colleagues found that two out of every three animals in the pictures were oriented in a direction roughly pointing to magnetic north.

The resolution of the images was not sufficient to tell which ends of the cows were pointing north, however, the report said.

Asked if he had ever observed such behaviour in cows, dairy farmer Rob Fletcher of Tulare said, "Absolutely not." But, he added, "I don t spend a lot of time worrying about stuff like that."

Similar results were found in field studies of 2,974 red and roe deer in the Czech Republic, the researchers reported today in the Proceedings of the National Academy of Sciences.

The researchers had been studying magnetism in smaller animals and were looking for a way to extend their work to larger species.

Cows are known to align their bodies facing uphill, facing into a strong wind to minimise heat loss or broadside to the sun on cold mornings to absorb heat, but the fact that the pictures were taken at many locations, at different times of day and in generally calm weather minimised the impact of environmental factors, the researchers were quoted as saying.
Source : PTI