Food culture in seed-eating animals : self-learning or social-learning

低地森林中的日本松鼠(Sciurus Lis)有一种快速打开核桃壳的特殊摄食技术。然而，栖息地没有核桃的针叶林中的松鼠没有适当的喂养技术来打开核桃壳。研究了年龄对学习喂养技术的影响，因此所有一岁以下的个体都能正确地吃核桃，但三岁以上的个体永远不能。因此，日本松鼠的核桃饲养技术可以通过从小学习来提高。

The Japanese squirrel(Sciurus lis) in lowland forests has a special feeding technique for quickly opening the walnut shell. However, squirrels living in coniferous forests without walnuts in their habitat did not have a proper feeding technique to open the walnuts shell. The effects of age on learning the feeding technique were examined, so that all individuals younger than one year were able to properly eat the walnuts but individuals older than 3 years were never. Consequently, the walnut feeding technique of the Japanese squirrel can be improved by learning at a young age.