A recent Trump executive order defines sex based on gamete size. But the order oversimplifies genetics, hormones and reproductive biology.

TULSA, Okla. — The Tulsa Zoo said Zoe, the 5-year-old reticulated giraffe, is pregnant. Tulsa Zoo said this will be Zoe's second calf and sibling to female Mi-Na. Normal giraffe gestation is 14 to 15 ...

Dinosaur skeletons outline where their reproductive organs would have been ... best guides to what extinct dinosaurs were like, their anatomy acting as an outline for what paleontologists expect ...

These new findings are crucial for giraffe taxonomy and, ultimately, their conservation. Giraffe skulls are important to the animals' reproduction ... mating success with female giraffe.

Using 3D geometric morphometric analysis, it was no surprise that the study revealed clear differences between male and female giraffe skulls. However, it was unexpected that the results confirmed the ...