What are the two favorite bamboos of giant pandas?

There are dozens of kinds of bamboo in the distribution area of giant pandas, but only two kinds of bamboo are deeply loved by giant pandas.

There may be two reasons: first, the giant panda eats a lot, so those bamboo species with small distribution area are far from meeting its needs; Secondly, because giant pandas eat the sweet bamboo of cold arrow orange for a long time, they are partial to food.