Giant panda Funi was artificially inseminated on two occasions in mid-September during the yearly panda breeding season and has since been treated as if possibly pregnant.
But zoo officials say confirming a pregnancy is difficult in pandas and usually only achieved with an ultrasound.
Funi's situation has been further complicated by her recent unwillingness to cooperate with vets and keepers to have the required test.
Either way the zoo says it should know by the end of this month if a baby is on the way.
Funi and her mate Wang Wang arrived in Adelaide in 2009 on loan from China for 10 years.
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Since then several attempts to have them breed have proved unsuccessful.

