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Ants call for emergency backup with chemical trail
By Victoria GillScience reporter, BBC Nature
See the ants' "chemical nets" dragging nestmates towards the food item
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Researchers found that when an ant discovered food that was too large to carry, it immediatelyset off for the nest, laying a pungent chemical trail.
This almost instantly caused hundreds of other ants to rush in and help drag back the oversized snack.
The team thinks the species' "chemicalbreadcrumb trail" is the fastest and most accurate ever recorded.
The findings from this study are reported in the journal Behavioural Ecology and Sociobiology.
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Only ants and humans are able to "organise themselves into teams" to lift heavyobjects.
Although many ant species use chemical trails to organise themselves into food-collecting groups, the big-headed ant has an "extreme" chemical enlisting strategy, says the University ofSussex team.
Tomer Czaczkes, the scientist who led the study - and who filmed the ants at work in the forests of Brazil - said that the insects were "incredibly accurate" when it came to following thetrail laid down by a fellow forager.
"When an ant finds something delicious," he said, "she has to lay a trail really quickly, because competition is fierce.
"The pheromone trail starts working...