Male and female dinosaurs from the same species sported different looks.
The dino couple, nicknamed Romeo and Juliet, were entombed together for over 75 million years.
An extremely rare bilateral gynandromorph cardinal makes a surprise visit to a backyard feeder in Texas.
Variety is the spice of life and animals know it pays to be flexible.
Female butterflies aren't interested in extra attention once they're pregnant.
Female southern elephant seals from an island between South Africa and Antarctica are skipping the traditional harems and finding equal opportunity for love at sea.