The least weasel (Mustela nivalis) is a remarkably well adapted predator of mice and other small animals. Each kill is rather stereotyped, in that the weasel grabs the prey by the nape of the neck and bites through the base of the skull and/or throat, using its lithe body to "wrap up" and hold the prey. The least weasel will kill mice successively until it is too exhausted physically to kill more. Mice are always eaten from the head posteriorly until completely consumed.
Heidt, Gary A.
"Anatomical and Behavioral Aspects of Killing and Feeding by the Least Weasel, Mustela nivalis L.,"
Journal of the Arkansas Academy of Science: Vol. 26
, Article 14.
Available at: http://scholarworks.uark.edu/jaas/vol26/iss1/14