Graph theory and computational modeling reveal that neural network architecture biases the male Caenorhabditis elegans brain toward prioritized sexual behaviors.

Researchers have shown that sex differences in animals vary dramatically across species, organs and developmental stages, and evolve quickly at the gene level but slowly at the cell type level.

Creatures that can change from one form to another are a staple of science fiction: Think werewolves and Transformers. Nature, too, has its shapeshifters, such as dimorphic fungi. While scientists ...

Humans are sexually dimorphic, which means that males and females are, on average, different sizes. In humans, like most sexually dimorphic species, males are typically larger than females. Why does ...

As butterflies flit among flowers, they don't all view blossoms the same way. In a phenomenon called sexually dimorphic vision, females of some butterfly species perceive ultraviolet color while the ...

It seems that reproductive success and sexual dimorphisms for dorsal color and for vision are inexorably interdependent in ruddy copper butterflies In August it is a joy to revel in fields full of ...

A new method to estimate sexual dimorphism in fossil species near the base of our family tree has been just published in the Proceedings of the National Academy of Science (PNAS), through the joint ...

Is it a sex difference or a gender difference? According to the Publication Manual of the American Psychological Association, "Gender is cultural and is the term to use when referring to women and men ...

From the same DNA, different genders can boast dramatically different characteristics. Dung beetles are helping scientists understand how. robertharding / Alamy Picture a lion: The male has a ...