Read more at http://swns.com. This prickly huddle of hoglets are lucky to be alive after they were found on a building site snuggling together for body heat in the sudden cold snap. The little hedgehogs were born late due to the warm Indian summer and at just three weeks weigh a fragile 60 grams - a tenth of the bodyweight needed to survive a harsh winter in the wild. The hogs, which have only opened their eyes in the last few days, were handed to experts at Shepreth Wildlife Park in Royston, Herts., who are fattening them up using a special milk formula. Rebecca Willers, Animal Manager at Shepreth Wildlife Park, said that the warm autumn meant baby hogs were being born later. She said: ''We have never received hoglets at such an incredibly small weight so late on in the season.