Siberian cranes migrate to Bharatpur during winter.

Ans. 1. Winter is very severe at Siberia in Russia. 2. Siberian cranes cannot tolerate such extremely low temperatures. 3. In Bharatpur, India, the climate is comparatively warmer and food is available in plenty. 4. Therefore, to escape from the unfavourable climatic conditions, Siberian cranes migrate to Bharatpur during winter.