Scientists study animal predies.

Living in tropical or low altitudes is more dangerous than living in colder environments.
this is the conclusion of a new study that doesn't go the wrong way.
researchers set up bright green earth caterpillars around the world.
have known that plant and animal species decrease as distance from the equator increases.
, they suspect that inters species interactions have similar effects, but no one has systematically studied them in different regions.
, the researchers created 2,900 fake caterpillars (pictured), which 40 colleagues placed at 31 locations at different latitudes and altitudes and then recovered them four to 18 days later.
back to the lab, ecologists integrated attacks from different predators, such as those who detected damage from birds, mice and ants.
showed that with each increase in latitude or 111 kilometres south or north of the equator, the daily attack on caterpillars decreased by 2.7 per cent.
, the rate of prednising is 1/8 of that of the equator at the far end, the Arctic.
researchers recently published the results in the journal Science.
in the tropics, there are differences in the number of arthropods (mainly ants) attacking: for every 100 metres of height increase, the attack rate decreases by 6.6 per cent.
although it is not clear whether this trend applies to planters, this means that ecologists need to keep this in mind as they calculate the dynamics of the ecosystem.
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