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Doctors in the USA have transplanted a pig's heart into a man. It is the
time this has happened. The
are from the University of Maryland Medical Center. They say David Bennett, 57, is doing well after his operation. Mr Bennett was very
. The doctors said giving him the pig's heart was the
chance of keeping him
. Bennett spoke to doctors the day before the
. He said: "It was either die or do this transplant. I want to live. I know it's a
in the dark, but it's my last
." The pig's heart came from a genetically-modified pig. Scientists changed the
of the pig so its heart would be more
for a transplant into a human.
