在國外出生的熊貓通常會被送回中國，這背後有多重原因，主要涉及繁殖計劃、保護措施和國際協議。首先，因為是國寶，中國對熊貓的保護有著嚴格的規定。中國與其他國家簽訂的租借協議有明文規定，所有在國外出生的熊貓屬於中國所有，在滿一定年齡後都需要返回中國，通常是3歲以後。因為熊貓會開始步入發春期，要開始尋找適合的對象進行配對。這一做法的目的是確保熊貓種群的基因多樣性，並進一步推動相關的繁殖計劃。返回的熊貓將被安置在專門的保護區內進行繁育，從而提高存活率和種群數量。

此外，租借協議通常包含多項限制和條件。首先，要租借的國家必須與中國的外交關係良好，並保證為熊貓提供適宜的生活環境，包括適當的飲食、醫療保健和棲息地條件。確保熊貓在租借期間得到良好的照顧。其次，租借國家需要支付高額的租借費用，每隻大熊貓的年租金不低於100萬美元，在租借期間每產下一隻幼崽需要向中國支付60萬美元，這些費用通常用於支持熊貓的保護和研究工作。租借的期限一般為10~15年，但具體租借期限可以根據雙方的協議進行調整。此外租借還涉及科學研究和保護教育等方面的合作。租借國家要定期提供熊貓的健康和行為報告，並支持相關的科研工作。這些報告和研究有助於進一步了解熊貓的生物學特徵和需求，從而制定更有效的飼養方式。

Pandas born abroad are typically sent back to China for several reasons, primarily related to breeding programs, conservation efforts, and international agreements. Firstly, as a national treasure, China has strict regulations for panda conservation. According to the lease agreements China signs with other countries, all pandas born overseas belong to China and must be returned after reaching a certain age, usually around three years old. This is because pandas begin to reach sexual maturity and need suitable mates. This practice aims to ensure genetic diversity within the panda population and further promote breeding programs. Returned pandas are placed in specialized conservation areas for breeding to increase survival rates and population numbers.

Additionally, the lease agreements often include numerous restrictions and conditions. Firstly, the borrowing country must maintain good diplomatic relations with China and guarantee a suitable living environment for the pandas, including proper diet, healthcare, and habitat conditions, ensuring the pandas are well-cared for during their stay. Secondly, the borrowing country must pay a substantial leasing fee, with an annual rent of at least $1 million per panda. If a cub is born during the lease period, an additional fee of $600,000 per cub is required. These funds typically support panda conservation and research efforts. The lease term generally ranges from 10 to 15 years, but the specific duration can be adjusted according to mutual agreement. Furthermore, the lease involves cooperation in scientific research and conservation education. The borrowing country must regularly provide health and behavior reports on the pandas and support relevant scientific research. These reports and studies help further understand the biological characteristics and needs of pandas, leading to more effective care strategies.

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