In all, five piglets were born and four of them have the tell-tale glowing noses.
This wasn't done for fun, the experiment has a serious side to it.
Reasons
By proving it is possible to mix genetic material from two different animals together, scientists have shown it may be safe to use animals to grow human organs for transplant.
Thousands of people die each year waiting for organ transplants and using animals to grow the organs needed could save many lives.
