This chaffinch flew into our window. He laid on the extension roof on its back. His legs were kicking slightly. I picked him up and held him in both my hands to keep him warm. The temperature was very cold with snow on the ground. He seemed to be concussed. His feet and claws couldn't grip. We put him into a shoe box with bedding and after 45 minuets he started to perk up and he found strength in his legs. I took him outside and he managed to stand on the wood logs. All turned out well as he flew off to meet his mates.