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Doctors at the University of Maryland Medical School have saved a man's life by using the heart of a pig.
This is great news for medicine.
There is a lack of organs for people who need them.
People hope pig organs will be the solution.
Dr Bartley Griffith did the surgery.
57 year old David Bennett had poor health.
He couldn't receive a human heart.
Now, he's getting better but doctors are still watching to make sure everything is OK.
Muhammad Mohiuddin is a director at the Medical School.
He's excited about the results.
Scientists made some changes to the pig's heart.
They removed four genes and added 6 human genes.
They wanted the heart to work perfectly in the human body.
This is called gene editing.
Pigs' organs are perfect for humans because they grow fast and are a good size.
Muhammad Mohiuddin is excited about the new development.
He thinks animal organs will help save thousands of humans who need them.
