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Gibbons are the "singing lovers" of the rainforest. A bonded pair sings a "duet" every morning—a complex, overlapping song that is unique to that couple. It is a declaration: "We are together."
What makes a "romantic storyline" valid? Science increasingly shows that animals feel the same core emotions we do.
While rare in mammals (only about 3%), several species are famous for forming stable, lifelong pair bonds: