These pictures will melt your heart.
Mother Tonja has given birth to two polar bear cubs, but only one survived. The zoo's polar curator has warned of the cub's vulnerability months after Tonja's firstborn died.
Berlin's Tierpark Zoo has said that the baby polar bear born just last month had died of unknown causes. Another cub from the same mother had died earlier last year.
An increasing number of polar bears can't catch enough prey to fill their stomach, researchers found. As a result, many bears are losing weight — a development that could push the species closer to extinction.
Polar bear cubs like Fritz of Berlin's Tierpark are cute and enjoy popularity. But is a zoo really the right place for them?
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