It may outlive all its siblings, there is no specific age
The small animal in a litter is a runt.
A runt is the smallest in any litter. So every litter has a runt
Maybe she was the runt of the litter. For kids; Runt=smallest My rat was the runt of the litter we believe.
Runt of the Litter - 2009 SUSPENDED was released on: USA: 2009
The rabbit may have a runt in the second batch, but just as well may not. It depends on many factors including the buck, and how many kits are in the litter. One cannot say that she would or would not have a runt for sure.
Least Beast.
Runt
The runt of the litter
The smallest puppy in a litter is called the runt of the litter.
There is no specific height for a runt, really. But if you are trying to tell whether or not something is a runt, it is usually the smallest one of the litter.
The runt of the litter struggled to keep up with its larger siblings during playtime.
Tequila and Bonetti - 1992 Runt of the Litter 1-11 was released on: USA: 1992