Females of the new species are about 1cm in length, while males are 5mm at most.
Among these birds, females bring many feathers to the nest, while males rarely do.
In some insect species, females emerge from a fertilized egg, while males develop from unfertilized eggs.
Women still spend, on average, an hour a day on housework, while males might spend 20 minutes, the Economist reports.
At dusk, mother monkeys bathe their infants in the ceremonial fountains, while males fight noisily on the clipped lawns.
While males in other groups can be dwarfed by their females, female spiders often heavily outweigh their mates.
Even when it's monkeys who're given the choice, females apparently prefer playing with dolls while males prefer toy cars.
While males are hardly banished from the American Girl universe, they tend, fittingly enough, to play supporting roles.
In the wild, female goats tend to stay within their groups, while males disperse.
Female fruit flies express one form of the gene in their cells, while males express another.
Females have two X chromosomes, while males have an X and a Y chromosome.
