I made 4 shelters outside for my feral cats and they sleep curled up in leaves. They seem to be freezing, but at night it has been between 35 to 40 degrees. I would freeze outside at that temp. They watched every inch of me making the shelters. Peeking and sneaking around, as I talked with them and told them what I was doing. I just wonder if I am missing something. I followed the advice and made the entry way smaller. There is only one way out. Is that the problem? I know they have been in them. I see hair, but not sure why when they are cold they are not using them. I see them shivering and shaking. Advice anyone?