The two muelleri I have are adults. I started with four but two died I assume from starvation. They were really emaciated. My son and I are going to force feed them pinky rats today. Muelleri are attractive snakes and the two I have left are still glossy and plump looking even though they never ate. The day I got them one grabbed a small mouse, killed it, started to swallow it but spat it out with no further interest. I read yesterday that muelleri need 90F and a sand substrate. I will try that. Anyone know what their natural habitat is like in the Sahara?