Researchers think the embryo only re-starts its development after the female returns to lower elevations and can eat more of the calcium-rich leaves of arrow bamboo -- nutrients she needs for fetal bone growth and lactation.

研究员认为，胚胎只有在雌性熊猫回到海拔较低的地区后才会重新开始发育，在这些地区还能够吃到更多富含钙的箭竹叶——这是胎儿骨骼生长和母亲哺乳所需的营养物质。