Allie, a 37-year-old bottlenose dolphin, is in her second trimester of pregnancy and expected to give birth sometime in June, according to Dr. Michael Adkesson, Brookfield Zoo's president and CEO.
The yolk sac (YS) is the initial embryonic structure visible on ultrasound within the gestational sac (GS), typically detectable as early as 5 weeks of gestation, corresponding to 3 weeks ...
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