And what prompts her at three weeks of age to shrug off her nurse's togs and venture out into the world as a forager, a tireless gatherer of nectar and pollen, and the happenstance key to floral fecundity?

The term fecundity means the capacity to have large numbers of offspring; reproductive capacity.

Fecundity may be defined as the ability of a male or female to produce large number of functional Ova or sperm

Fecundity is synonymous with fertility; it means the capacity to produce numerous offspring.
Fecundity is being fertile.

Subfertility, fertility impaired.