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Date: Wed, 28 Aug 2002 13:55:54 +0100
Subject: [zzzzteana] Worryingly sophisticated bees
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Ananova:� 
Brazilian bees keep their own 'insect ranch'

Scientists have found a new species of bee that behaves like a farmer by
keeping herds of insects.
The Amazonian Schwarzula use their own 'insect ranches' to provide food and
building materials.
The bees nest in holes in trees alongside 200 aphid-like insects from a
species called cryptostigma.
Cryptostigma feed on tree sap and excrete a sugar solution, which the bees
stop them from drowning in, by licking it up and turning it into honey.
The insects also produce wax from glands on their backs, which the bees
scrape off and use for their nest.
Nature reports it is the first time farming behaviour has been discovered in
bees.
Biologist Joao Camargo, of the University of Sao Paulo in Brazil, said: "In
turn the bees provide the insects with sanitary benefits and protection."
Writing in the journal Biotropica, Camargo says the bees might even carry
their insect ranches around the forest with them and is planning further
research on how they tend to their herd.
Studies of the Schwarzula showed the bees seemed to get most of their sugar
from the insect farms. Some bees were seen licking human sweat for salt.
Story filed: 13:49 Wednesday 28th August 2002

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