I have often noticed that the dorados travel in male-female pairs.

Gardnerian Wicca and other more traditional groups form their covens from male-female pairs.

Once a male-female pair is found, they tend to yield 150-200 offspring after successfully mating.

The species is most often observed in solitary male-female pairs, or groups of two to seven individuals.

The royal gramma should not be kept with its own kind unless in a formed male-female pair.

But the dancers are often seen in male-female pairs and their use of energy suggests a metaphor about relationships.

Colonies size vary between one to seven individuals, consisting of a male-female adult pair and pup(s).

Into this context, he now introduces featureless figures, alone and in male-female pairs.

Ball screws, whose male-female pairs involve bearing balls in between, show that other variations of form are possible.