A quick size chart, giving a rough idea of the general size of The Mortox.

The left example is the top end of the size scale; Mortox rarely get any bigger.
The right is the smallest example, and is about as small as an adult Mortox will get.
Babies are tiny at birth, and litters consist of up to 15. At a year of age, they are about half the size of the smallest Mortox example.
It takes them about 4 years to get to full size.