Mei Xiang's enclosure has been closed to the public as she starts to den, signifying that she may be pregnant and could be due soon. The process of denning involves the panda taking bamboo and food in to a small dark cave like structure.
"Any (other) time I've seen Mei with a pear, she's eating it," said Baker-Masson.
Just because Mei Xiang is denning does not mean that she is pregnant, many pandas go though the same process if they have a false pregnancy.
Mei Xiang was artificially inseminated in January after she shown that she was in heat.