Giant Pandas breed one time a year, in the spring. During this time, males use their scent, and special calls to attract a female to breed with. Breeding from the Giant panda is very limited in this day and age, because towns and roads prevent males from attracting females. Pandas make their nest in hollowed out trees, and give birth about 150 days after being fertilized. Usually only two cubs are born, and triplets can sometimes be born. If the mother has twins, she will pick the strongest of the two twins, and the weaker one will die because she can only produce enough milk for one. After two years of following their mother around, the cubs will move on by themselves, and mate and have their own cubs.