It's tricky business, but there's a lot you can figure out from a human skeleton if you know what you're doing.
In mammals, the sex of a baby is determined by the chromosomes it inherits from its parents. But, the combination an animal inherits can be quite different.
Sure, there are physical differences but outside of mammals, the terms "male" and "female" take on different meanings.
For Australian cuttlefish, where males outnumber females four to one, how does a runt male stand a chance finding a mate? Learn more on this Moment of Science.
Imagine you're a female cardinal and you're looking for a mate. Before you are three males. Which one should you choose?
Fly often? If you do, who gets the arm rest? You? Or your neighbor?
Male Zeus bugs get a free ride, literally! Learn about the male-female relationship of the Zeus bug on this Moment of Science.
The relationships between plants and insects are often intricate and complex. One such relationship is that between the yucca plant and the yucca moth.
The most common form of hair loss in women is Androgenetic Alopecia or what is known as female pattern baldness. It accounts for over ninety-five percent of incidents of hair loss in women.