Giant panda Bei Bei turned four at Washington's National Zoo in the United States on Thursday, celebrating his last birthday before he would be shipped to China. /VCG Photo

The zoo prepared a colorful frozen cake for him, which was made of bamboo, fruits, carrots, sweet potatoes, and sugar cane. /VCG Photo

Bei Bei will soon return to China under the "loan agreement", which is applied to all giant pandas worldwide. His sister Baobao and brother Taishan will go through the same procedure. Their parents Mei Xiang and Tian Tian will stay in Washington at least until next year. /VCG Photo

The zoo hasn't scheduled the exact date for Bei Bei's move, but it said that it would happen in the next few months. /VCG Photo