An important attribute of a species is the average number of
offspring each adult is expected to produce. The parameter
**R** will represent the reproductive rate, which can range from
a value as small as 2 (for mammals and other higher animals) to
as high as 10,000 or more (for plants with thousands of seeds).

The reproductive rate plays a role in the creation of a new
generation. In the mathematical model, we assume the current
generation produces offspring, where **n** is the
size of the current generation. Of these, at most **K** survive
to form the next generation.