After Tens of Thousands of Pigeons Vanish, One Comes Back

&gt; Mouritsen thinks, that the reason those warblers left Tennessee was not because they heard wisps of a distant superstorm but because of changes in atmospheric pressure.<p>Sound <i>is</i> changes in atmospheric pressure, and we&#x27;re talking about infrasound which is really low frequency, so there&#x27;s not exactly a sharp distinction here.

I&#x27;d like something that keeps pigeons off my balcony. Surprisingly little works. I have a motion detecting sonic alarm that doesn&#x27;t work - maybe it&#x27;s in the wrong frequency for pigeons. I wonder if a motion detecting laser frightener would work better. Kickstarter anyone?

I&#x27;ve got a feeling in a couple decades the military will declassify how they used some kind of new ULF device to talk to submarines and it had a power level equal to nuclear weapons.<p>And that as a side effect it screwed up all kinds of wildlife.

For sure this is interesting, but it&#x27;s curious that articles of this sort are appearing on HN with increasing frequency. There used to be purely tech news, now it seems that anything interesting qualifies for an up vote.