He has no other role to play than mating with her to produce young. After a male has mated with her, he might return to her to mate again but will not be involved with her during her pregnancy or afterward. The female will continue to attract males with her pheromones and chirping for about two weeks to ensure that she is pregnant. This plug prevents the sperm of other males from impregnating her, though it can fail, and one litter can be produced by multiple fathers. Once a male catches up with and wins the undisturbed opportunity to mate with the female (mating only takes about a minute), he finishes by ejaculating a waxy plug into the female’s vagina. They merely chase and try to intimidate one another until one submits and flees the scene. Even in this case, however, the squirrels do not injure one another. Most squirrels, with the exception of Red squirrels, are non-territorial, so this is the only time they will act aggressively toward one another.
Older male squirrels are normally larger and so will win the fight against a younger male. If two males are pursuing her at the same time, they will fight each other for the chance. The males in the area will seek out the female and then chase her for the opportunity to mate with her. Males are fertile all year round, but females only once or twice a year, so the males become very excited when they hear and smell a female ready to produce young. These scents and sounds attract male squirrels and alert them that a female is fertile. When a female squirrel is approximately one year old, and the weather starts warm from winter to spring, she will begin to emit specific pheromones and make chirping noises.
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