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Male Bowerbirds Arrange Objects to Make Themselves Look Bigger

September 12, 2010
They create forced perspective illusions that only females see.
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Male bowerbirds build elaborate shelters to try to attract a female. They decorate these bachelor pads with shells, bones and pebbles, and even lay a pathway of sticks along which the female can walk to get the best view. But that path provides more than just a welcome mat. It allows the male bird to set the stage so that the décor will accentuate—even exaggerate—his size, a typical sign of good genes.
See, male bowerbirds line their courtyards with objects arranged from smallest to largest. Viewed from the walkway, this layout makes the court seem smaller and the bird sitting at its center look larger. When scientists went in and reversed the gradient, the male bowerbirds restored it within days
Of course, the females may be on to the trick. And rather than being fooled about size, a female may be selecting a male based on how clever he is to make himself look so swell. Or so swelled
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Inverted bowers
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