The RSPCA is appealing for information about two guinea pigs found in an upturned box in a layby near St Albans on Tuesday.
The guinea pigs are both young boars (males) and ginger and white in colour and were found in Nashes Farm Lane in Sandridge.
RSPCA animal collection officer Kate Wright said: "The box was in a disgusting state suggesting that they were probably living in it prior to being abandoned in it.
"They escaped when the member of the public turned the box over to see what it contained but were easily recaptured and are both in a healthy condition.
"It was a reckless thing to leave guinea pigs in such a dangerous environment and I am grateful that they were found before anything happened to them.
"If anyone recognises these guinea pigs or can tell me anything about how they came to be in the layby could they please call the RSPCA inspector information line on 0300 123 8018 and leave a message in confidence."
The boars are now in the care of Kate Wright who also runs a guinea pig rescue.
If anyone is interested in rehoming these two or any others they can contact Kate.