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Indeed caterpillars are not going to whistle like a bird through their mouths. However, according to the researchers, caterpillars could whistle through the sides of their bodies.
This they do as a defense mechanism to ward off predatory birds. From the results of a study of walnut caterpillars sphinx caterpillar or Arnorpha juglandis, as long as they are whistling coming from their bodies.
As quoted by LiveScience, when observed through high-speed video, the researchers concluded when the caterpillar to whistle, they pressed their heads to the rear.
This is done to reduce cavities in their bodies so that whistling sound coming out through eight pairs of vent in their stomachs.
Each pair of the abdominal cavity was squeaking about four seconds, with a range of frequencies that can be heard by the bird and human, to sound an ultrasound.
When the researchers looked at the caterpillar, bird warbler (bird chirping clever) who want to prey on caterpillars, it will usually be shocked and ran helter-skelter when the caterpillars began to whistle. These caterpillars whistle always save him from the raid bird warbler.
"These birds seem startled by whistling the caterpillars because they do not think it would sound," said Jayne Yack, Neuroethologist from Carleton University, Ottawa Canada. (sj)