Jays Establish Good Nuts by Shaking Them
Written by GrrlScientist
That is BirdNote.
Some birds stash unopened seeds to be used later. However how do they know which seeds are definitely worth the hassle, earlier than expending invaluable power to open them? [Mexican Jay call and mechanical sound http://macaulaylibrary.org/audio/96005]
Not too long ago revealed analysis by a staff of scientists from South Korea and Poland might present a solution. In a sequence of experiments, they introduced jays with ten peanut shells that had been emptied of their nuts and resealed — and ten peanut shells with nuts inside. Not surprisingly, the jays most well-liked the shells that had nuts in them.
Within the subsequent experiment, all of the shells had nuts in them — however some had one and a few had three. This time, the jays most well-liked the three-nut shells. Additional analysis instructed that the jays additionally most well-liked heavier shells over people who had the identical variety of nuts in them, however weighed much less.
Utilizing slow-motion cameras, researchers noticed that the birds have been shaking the nuts of their beaks to evaluate their weight and probably additionally listening for the nuts rattling. In different phrases, jays use the identical sorts of sensory cues that we do after we select a melon within the grocery store.
For BirdNote, I’m Michael Stein.
Bird sounds supplied by The Macaulay Library of Pure Sounds on the Cornell Lab of Ornithology, Ithaca, New York. Mexican Jays  recorded by William W H Gunn.
BirdNote’s theme music was composed and performed by Nancy Rumbel and John Kessler.
Producer: John Kessler
Government Producer: Dominic Black
© 2015 Tune In to Nature.org August 2015/2022 Narrator : Michael Stein
ID# MEJA-01-2015-08-11 MEJA-01