[blackdog]

Trail cameras emit a frequency from their processor and power supply at around 15hz and then multiples of that as harmonics. So, 15, 225, 5.625 Mhz, and so on. The wildlife can hear 15Hz and 225Hz. Some echo locating wildlife hear into the UHF range. Unshielded consumer electronics like trail cameras sound like a constant whistle to animals with radiated emissions.

[Graybeard58]

Unshielded consumer electronics like trail cameras sound like a constant whistle to animals with radiated emissions.

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Not challenging that by any means but how can what it sounds like to animals be confirmed?

[21twelve]

That is one of the theories of why Bigfoot is never caught on a trail cam!

On a serious note, I was just reading an article with wonderful photos of animals caught on trail cams in Northern Minnesota (mostly along the North Shore of Lake Superior).

They included a mountain lion and a badger - both very rare in Minnesota.

[KarlInOhio]

Back when TVs were expensive enough that a repairman came out for warranty work rather than just swapping for a new one at the store, I had something in the flyback system come loose and it howled at 15.734 kHz. The repairman was an older man who could not hear it at all, but knew what it was when I described it. After he had the back off he asked me to tell him when the sound went away.

I guess the sound would be like that for animals that can hear above 20 kHz.