My little girl (collared lizard), Joan, passed away recently and I'm not sure why. Joan suddenly stopped eating and drinking. I tried to find a liquid food to force down her throat, but I couldn't find anything. She just grew weaker and weaker, until eventually she burrowed down into the sand in her cage and died. She acted normal and was healthy up until I took her friend, Walter, out of the cage which leads me to believe she was depressed. Does anyone know about lizard depression? I want to know why Joan died before i get a new lizard.