(Sky News)
A 4-year-old boy from California has come home from a family beach holiday with a rather unusual souvenir -- a sea snail which hatched and grew inside his knee.
Paul Franklin, from Aliso Viejo in Orange County, fell and grazed his knee on rocks while on a summer camping trip.
His parents became worried as the wound started to become swollen and infected.
Three weeks later, the boy's mother, Rachael, decided to squeeze the sore on his knee - and out popped the sea-snail.
"His knee was size of orange, and hot to the touch and he's limping.
She said what came out "looked like a rock - it was a black thing and I put it on paper-towel and it had whirls and I turned it over and it was a sea-snail and I just like had to laugh."
Stay up-to-date on the biggest health and wellness news with our weekly recap.