Woodpecker strikes the tree trunk with his beak at regular intervals. By evaluating the reflected voices, he discovers at what point the cudgel is caterpillar. So it does not bother to drill in vain.
I think he could not find the tree in the city he was in :)
nice photos congratulations
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Thanks for your comment. That is true yes when they tap on trees These birds live in paradise surrounded by trees on every side and the rainforest so it is not for lack of real trees they do this.