So I was just watching a Discovery channel special on dinosaurs and I was reminded of how animals use low frequency for communication and even defense. As early as this Parasaurolophus YouTube - Clash of the Dinosaurs: The Defenders - Duckbill Sound Machine
and even Elephants, Crocodiles, and Whales can produce them today.

 

Hey, I like this... See, I remember an alarm thread not to long ago... Sooooo if you have a croc in the car, you kill two birds with one stone, SPL and security! Eli, you are a genious! lol It's cool the strange little facts that are out there

 

link does not work like all youtube videos

 

YouTube has a coding after the / at the very end ... you need to copy and paste that and then push the YouTube button here in the "Advanced" reply (don't use the quick one) and bam ... you posted a YouTube video!

 

it's one of the uses of the Bass Tech 7 ... the used it to try to mimmic sounds of elephant stomps ...