Defending TerritoryThe primary reason why you would likely notice a squirrel stomping its feet is that you, or another animal near you, a dog, a bird, perhaps a nearby hawk or cat, something has entered the territory of that squirrel. The squirrel is sending a message to let intruders and other nearby squirrels know something is amiss; a foreign object has entered the ring.
Mating CommunicationSquirrels, just like everything else in nature, have specific mating rituals and seasons. Squirrels usually mate and give birth twice a year. Female squirrels are known to mate with more than one partner throughout a mating season but are generally only inseminated once due to the nature of how squirrel mating works. Baby squirrels are called kits or kittens. Squirrels litters can vary in size but range from one to upwards of six kits at a time. But before the hairless, deaf, and blind kittens can enter the picture, squirrels have to go through a series of mating behaviours.