'This is so weird from an evolutionary perspective,' a co-author of the new study says.
Steven Gaines, New York Institute of Technology College of Osteopathic MedicineTartufo, the rosy-faced lovebird, has more limbs than you think. He’s got two wings, which, of course, he uses to fly. He’s got two legs, which he uses to grab branches and hop around the canopy. But when faced with an especially steep tree, he relies on a third: his head., rosy-faced lovebirds—a type of diminutive parrot—are members of a rare few vertebrates that walk with an odd number of limbs.
Granatosky has a pet cockatiel, Rex, says Melody Young, the paper’s lead author, and a graduate student at the New York Institute of Technology. “So he would watch his parrot climbing and think ‘I want those forces.’” “They would climb on you as much as they would climb on the runway,” Granatosky adds. “The hardest part is trying to keep them on there.”
The parrots don’t always walk with three limbs. By tilting the runway, the researchers showed that they only began to use their mouths when going up a 45 degree slope, and relied more and more on their head as the runway got steeper.For the lovebirds, that makes the head a close analogue to the way people use our arms when rock climbing.
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