Experts are closely monitoring the hormone and protein levels in the animal's urine on a daily basis, but officials cautioned they would not be certain until
"This is all very new and complex science and we still have a bit of time to go yet, as like last year, the late loss of a cub remains entirely possible," said
Giant pandas have difficulty breeding and their pregnancies are notoriously difficult to follow because the animals experience "pseudo-pregnancies" — their behavior and hormonal changes do not indicate for certain whether they are pregnant or not.
The mammals' fetuses do not start to develop until the final weeks of gestation.
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