08/11/13 17:00:26
Gerald Wilkinson, a professor of biology at the University of Maryland,
decided to find out what was going on among the vampire bats.
He spent many hours looking closely inside the trees where vampire bats
were gathering.
He also set up acolony at the University of Maryland so that he could
keep a closer watch on particular individuals and which bats they fed
and were fed by.
Wilkinson noticed that sometimes one bat would do the feeding and at
other times it would be fed by the others, and it was this difference
that gave him a clue as to what was going on.
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