Georgina Hirst, a veterinarian, spotted these two friends in the Black Mountains of Wales:
"The lamb was obviously hungry and it's quite amazing that it learnt to suckle from the mare. It might have just copied the foal."
The vet, from Hay on the Wye, Powys, added: "Trying to get mares to adopt foals can be very challenging so it's incredible the mare was so receptive of the lamb.
"She would even stand guard while the foal and the lamb slept cuddled together."