I took in two baby bunnies 3 weeks ago, as they were part of an accidental litter and the owner was keeping them in a 2 foot hutch with the mum and dad I had fallen in love with them, because I've always rescued adults they were the youngest I've had as they were just 8 weeks. One was quite a lot bigger than the other but they seemed quite healthy. The little one (Dory) was alive at 4pm when I checked the waters but dead and stiff at 9 o'clock her sister was sat on top of her body. I can't find any signs of why she died, her eyes look a little wet but thats it. Do you think she just couldn't take the cold? It has gone from being about 4degrees to -6 in the last two days. They are on a deep bed of hay. I kept them outside as that was how they were born and where living. If I took her to the vets to get her checked over to make sure its nothing contageous would they charge me? All my other bunnies apart from the two babies are vaccinated.