*Is she or isn’t she? We still don’t know for sure. Here’s what we do know: Chinook’s fecal hormone profile as of mid-November indicated that pregnancy was still a possibility but birth most likely would be no sooner than January. We have been doing weekly ultrasound exams since October, and the images neither confirm nor deny pregnancy. Polar bears are delayed implanters, so we don’t usually see the uterus unless there is something happening. As of the ultrasound exam this week, our veterinarians are still able to see her uterus. With both these indicators, we are definitely not throwing in the towel.
Chinook’s behavior, though, is picking up. She is playing every day on exhibit and in her back pool. Chinook is also soliciting lots of play time with her keepers. She does, however, go to sleep in her massive bed by noon, again both good and not-so-good signs for pregnancy. The good part: whatever the outcome, our girl is having a very comfortable time keeping us all on pins and needles!
*UPDATE: Chinook has very effectively communicated as of January 1, 2013 that she is NOT pregnant and please very much would like to go play with Tatqiq and that very handsome Kalluk. Today’s ultrasound session also convinced us that we are no longer on pins and needles. So tomorrow all three will be re-united. So uncross those fingers and toes and let them rest until next year!
JoAnne Simerson is a senior keeper at the San Diego Zoo. Read her previous post, Polar Bears: A Wild Study.