The Cincinnati Zoo & Botanical Garden counts on federal funds to grow cat, polar bear and rhino populations country-wide. The dollars could go away.

While black bears typically have their mating season in the summer, the embryos don't begin to develop until the mother has entered her den, and the cubs are born sometime in the winter ...

Mating season lasts from May through July. As in all bear species, fertilized embryos delay implantation in the female’s uterus. If a sow isn’t vigorous enough to sustain a pregnancy, ...

cases and I.V.F. disputes, the frozen embryos vials like these will hold are increasingly caught The Embryo Question is a three-part series about the cluster of cells at the crossroads of science ...