57 year-old living in the US
A dying man in the US has become the first in the world to receive a pig's heart in a transplant.
57-year-old David Bennett is said to be breathing by himself - three days after receiving the genetically-modified organ.
The operation, taking place at the University of Maryland Medical Centre, lasted 7 hours.
Mr. Bennett, who has terminal heart disease, had been previously deemed too ill to receive a human heart.
It's too soon to know if the transplant will work long-term, but his surgeon Professor Bartley Griffith says it's a lifeline:
Mr. Bennett had previously said he had two options, to die, or undergo the experimental procedure.

US And Iran Say Deal Reached To End War
US Launch New Strikes Against Iran
Company Behind Chatbot Calls For Paused Global AI Development
Israeli Ministers Ben-Gvir And Smotrich Barred From Travel To Ireland
Fine Gael Faces Criticism Following Recent EU Migration Decisions
Ceasefire Agreed Between Israel And Lebanon
18 Dead After Russian Overnight Attack On Ukraine
21 Year Old Jailed For Planned Terror Attack On 2024 Taylor Swift Concert